diff --git a/Makefile.in b/Makefile.in
index 994c14c68f..e64f651b12 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -734,7 +734,7 @@ LDFLAGS_libsqlite = \
   $(LDFLAGS_RPATH) $(TLIBS) $(LDFLAGS_MATH) $(LDFLAGS_ZLIB)
 # LDFLAGS_libsqlite should be used with any target which
 # either results in building libsqlite3.so, builds sqlite3.c
-# directly, links in sqlite3.o, or links in $(LIBOBJS0).
+# directly, links in either of $(LIBOBJSO) or $(LIBOBJS1).
 
 $(libsqlite3.DLL):	$(LIBOBJ)
 	$(TLINK) -o $@ \
@@ -1744,7 +1744,7 @@ tidy:
 	rm -f showjournal$(TEXE) showstat4$(TEXE) showwal$(TEXE) speedtest1$(TEXE)
 	rm -f wordcount$(TEXE) changeset$(TEXE) version-info$(TEXE)
 	rm -f *.dll *.lib *.exp *.pc *.vsix *.so *.dylib pkgIndex.tcl
-	rm -f sqlite3_analyzer$(TEXE) sqlite3-rsync$(TEXE)
+	rm -f sqlite3_analyzer$(TEXE) sqlite3-rsync$(TEXE) sqlite3_expert$(TEXE)
 	rm -f mptester$(TEXE) rbu$(TEXE)	srcck1$(TEXE)
 	rm -f fuzzershell$(TEXE) fuzzcheck$(TEXE) sqldiff$(TEXE) dbhash$(TEXE)
 	rm -f threadtest5$(TEXE)
@@ -1755,11 +1755,12 @@ tidy:
 #
 clean:	tidy
 	rm -rf omittest* testrunner* testdir*
+	-gmake -C ext/wasm distclean
 
 # Clean up everything.  No exceptions.
-#
 distclean:	clean
-	rm -f sqlite_cfg.h config.log config.status $(BTCL) Makefile $(LIBTOOL)
+	rm -f sqlite_cfg.h config.log config.status $(JIMSH) Makefile
+	-gmake -C ext/wasm distclean
 
 #XX##
 #XX## Windows section
diff --git a/ext/fts5/fts5Int.h b/ext/fts5/fts5Int.h
index b15521f163..51d8081774 100644
--- a/ext/fts5/fts5Int.h
+++ b/ext/fts5/fts5Int.h
@@ -224,6 +224,7 @@ struct Fts5Config {
   int *aPrefix;                   /* Sizes in bytes of nPrefix prefix indexes */
   int eContent;                   /* An FTS5_CONTENT value */
   int bContentlessDelete;         /* "contentless_delete=" option (dflt==0) */
+  int bContentlessUnindexed;      /* "contentless_unindexed=" option (dflt=0) */
   char *zContent;                 /* content table */ 
   char *zContentRowid;            /* "content_rowid=" option value */ 
   int bColumnsize;                /* "columnsize=" option value (dflt==1) */
@@ -262,9 +263,10 @@ struct Fts5Config {
 #define FTS5_CURRENT_VERSION               4
 #define FTS5_CURRENT_VERSION_SECUREDELETE  5
 
-#define FTS5_CONTENT_NORMAL   0
-#define FTS5_CONTENT_NONE     1
-#define FTS5_CONTENT_EXTERNAL 2
+#define FTS5_CONTENT_NORMAL    0
+#define FTS5_CONTENT_NONE      1
+#define FTS5_CONTENT_EXTERNAL  2
+#define FTS5_CONTENT_UNINDEXED 3
 
 #define FTS5_DETAIL_FULL      0
 #define FTS5_DETAIL_NONE      1
@@ -724,7 +726,7 @@ int sqlite3Fts5DropAll(Fts5Config*);
 int sqlite3Fts5CreateTable(Fts5Config*, const char*, const char*, int, char **);
 
 int sqlite3Fts5StorageDelete(Fts5Storage *p, i64, sqlite3_value**, int);
-int sqlite3Fts5StorageContentInsert(Fts5Storage *p, sqlite3_value**, i64*);
+int sqlite3Fts5StorageContentInsert(Fts5Storage *p, int, sqlite3_value**, i64*);
 int sqlite3Fts5StorageIndexInsert(Fts5Storage *p, sqlite3_value**, i64);
 
 int sqlite3Fts5StorageIntegrity(Fts5Storage *p, int iArg);
diff --git a/ext/fts5/fts5_config.c b/ext/fts5/fts5_config.c
index 1fade5f7a8..a674b44d0b 100644
--- a/ext/fts5/fts5_config.c
+++ b/ext/fts5/fts5_config.c
@@ -241,6 +241,7 @@ static int fts5ConfigParseSpecial(
 ){
   int rc = SQLITE_OK;
   int nCmd = (int)strlen(zCmd);
+
   if( sqlite3_strnicmp("prefix", zCmd, nCmd)==0 ){
     const int nByte = sizeof(int) * FTS5_MAX_PREFIX_INDEXES;
     const char *p;
@@ -360,6 +361,16 @@ static int fts5ConfigParseSpecial(
     return rc;
   }
 
+  if( sqlite3_strnicmp("contentless_unindexed", zCmd, nCmd)==0 ){
+    if( (zArg[0]!='0' && zArg[0]!='1') || zArg[1]!='\0' ){
+      *pzErr = sqlite3_mprintf("malformed contentless_delete=... directive");
+      rc = SQLITE_ERROR;
+    }else{
+      pConfig->bContentlessUnindexed = (zArg[0]=='1');
+    }
+    return rc;
+  }
+
   if( sqlite3_strnicmp("content_rowid", zCmd, nCmd)==0 ){
     if( pConfig->zContentRowid ){
       *pzErr = sqlite3_mprintf("multiple content_rowid=... directives");
@@ -477,7 +488,8 @@ static int fts5ConfigParseColumn(
   Fts5Config *p, 
   char *zCol, 
   char *zArg, 
-  char **pzErr
+  char **pzErr,
+  int *pbUnindexed
 ){
   int rc = SQLITE_OK;
   if( 0==sqlite3_stricmp(zCol, FTS5_RANK_NAME) 
@@ -488,6 +500,7 @@ static int fts5ConfigParseColumn(
   }else if( zArg ){
     if( 0==sqlite3_stricmp(zArg, "unindexed") ){
       p->abUnindexed[p->nCol] = 1;
+      *pbUnindexed = 1;
     }else{
       *pzErr = sqlite3_mprintf("unrecognized column option: %s", zArg);
       rc = SQLITE_ERROR;
@@ -508,11 +521,17 @@ static int fts5ConfigMakeExprlist(Fts5Config *p){
 
   sqlite3Fts5BufferAppendPrintf(&rc, &buf, "T.%Q", p->zContentRowid);
   if( p->eContent!=FTS5_CONTENT_NONE ){
+    assert( p->eContent==FTS5_CONTENT_EXTERNAL
+         || p->eContent==FTS5_CONTENT_NORMAL
+         || p->eContent==FTS5_CONTENT_UNINDEXED
+    );
     for(i=0; i<p->nCol; i++){
       if( p->eContent==FTS5_CONTENT_EXTERNAL ){
         sqlite3Fts5BufferAppendPrintf(&rc, &buf, ", T.%Q", p->azCol[i]);
-      }else{
+      }else if( p->eContent==FTS5_CONTENT_NORMAL || p->abUnindexed[i] ){
         sqlite3Fts5BufferAppendPrintf(&rc, &buf, ", T.c%d", i);
+      }else{
+        sqlite3Fts5BufferAppendPrintf(&rc, &buf, ", NULL");
       }
     }
   }
@@ -555,6 +574,7 @@ int sqlite3Fts5ConfigParse(
   Fts5Config *pRet;               /* New object to return */
   int i;
   sqlite3_int64 nByte;
+  int bUnindexed = 0;             /* True if there are one or more UNINDEXED */
 
   *ppOut = pRet = (Fts5Config*)sqlite3_malloc(sizeof(Fts5Config));
   if( pRet==0 ) return SQLITE_NOMEM;
@@ -614,7 +634,7 @@ int sqlite3Fts5ConfigParse(
             pzErr
           );
         }else{
-          rc = fts5ConfigParseColumn(pRet, zOne, zTwo, pzErr);
+          rc = fts5ConfigParseColumn(pRet, zOne, zTwo, pzErr, &bUnindexed);
           zOne = 0;
         }
       }
@@ -646,14 +666,30 @@ int sqlite3Fts5ConfigParse(
     rc = SQLITE_ERROR;
   }
 
+  /* We only allow contentless_unindexed=1 if the table is actually a
+  ** contentless one.
+  */
+  if( rc==SQLITE_OK 
+   && pRet->bContentlessUnindexed 
+   && pRet->eContent!=FTS5_CONTENT_NONE
+  ){
+    *pzErr = sqlite3_mprintf(
+        "contentless_unindexed=1 requires a contentless table"
+    );
+    rc = SQLITE_ERROR;
+  }
+
   /* If no zContent option was specified, fill in the default values. */
   if( rc==SQLITE_OK && pRet->zContent==0 ){
     const char *zTail = 0;
-    assert( pRet->eContent==FTS5_CONTENT_NORMAL 
-         || pRet->eContent==FTS5_CONTENT_NONE 
+    assert( pRet->eContent==FTS5_CONTENT_NORMAL
+         || pRet->eContent==FTS5_CONTENT_NONE
     );
     if( pRet->eContent==FTS5_CONTENT_NORMAL ){
       zTail = "content";
+    }else if( bUnindexed && pRet->bContentlessUnindexed ){
+      pRet->eContent = FTS5_CONTENT_UNINDEXED;
+      zTail = "content";
     }else if( pRet->bColumnsize ){
       zTail = "docsize";
     }
diff --git a/ext/fts5/fts5_index.c b/ext/fts5/fts5_index.c
index 4363305a56..a51ae19e72 100644
--- a/ext/fts5/fts5_index.c
+++ b/ext/fts5/fts5_index.c
@@ -4889,6 +4889,11 @@ static int fts5IndexFindDeleteMerge(Fts5Index *p, Fts5Structure *pStruct){
           nBest = nPercent;
         }
       }
+
+      /* If pLvl is already the input level to an ongoing merge, look no
+      ** further for a merge candidate. The caller should be allowed to
+      ** continue merging from pLvl first.  */
+      if( pLvl->nMerge ) break;
     }
   }
   return iRet;
@@ -8813,7 +8818,7 @@ static int fts5structConnectMethod(
 
 /*
 ** We must have a single struct=? constraint that will be passed through
-** into the xFilter method.  If there is no valid stmt=? constraint,
+** into the xFilter method.  If there is no valid struct=? constraint,
 ** then return an SQLITE_CONSTRAINT error.
 */
 static int fts5structBestIndexMethod(
diff --git a/ext/fts5/fts5_main.c b/ext/fts5/fts5_main.c
index db413b572a..5713fccdd1 100644
--- a/ext/fts5/fts5_main.c
+++ b/ext/fts5/fts5_main.c
@@ -332,10 +332,16 @@ static void fts5CheckTransactionState(Fts5FullTable *p, int op, int iSavepoint){
 #endif
 
 /*
-** Return true if pTab is a contentless table.
+** Return true if pTab is a contentless table. If parameter bIncludeUnindexed
+** is true, this includes contentless tables that store UNINDEXED columns
+** only.
 */
-static int fts5IsContentless(Fts5FullTable *pTab){
-  return pTab->p.pConfig->eContent==FTS5_CONTENT_NONE;
+static int fts5IsContentless(Fts5FullTable *pTab, int bIncludeUnindexed){
+  int eContent = pTab->p.pConfig->eContent;
+  return (
+    eContent==FTS5_CONTENT_NONE 
+    || (bIncludeUnindexed && eContent==FTS5_CONTENT_UNINDEXED)
+  );
 }
 
 /*
@@ -1726,7 +1732,7 @@ static int fts5SpecialInsert(
     }
     bLoadConfig = 1;
   }else if( 0==sqlite3_stricmp("rebuild", zCmd) ){
-    if( pConfig->eContent==FTS5_CONTENT_NONE ){
+    if( fts5IsContentless(pTab, 1) ){
       fts5SetVtabError(pTab, 
           "'rebuild' may not be used with a contentless fts5 table"
       );
@@ -1795,7 +1801,7 @@ static void fts5StorageInsert(
 ){
   int rc = *pRc;
   if( rc==SQLITE_OK ){
-    rc = sqlite3Fts5StorageContentInsert(pTab->pStorage, apVal, piRowid);
+    rc = sqlite3Fts5StorageContentInsert(pTab->pStorage, 0, apVal, piRowid);
   }
   if( rc==SQLITE_OK ){
     rc = sqlite3Fts5StorageIndexInsert(pTab->pStorage, apVal, *piRowid);
@@ -1803,6 +1809,67 @@ static void fts5StorageInsert(
   *pRc = rc;
 }
 
+/*
+**
+** This function is called when the user attempts an UPDATE on a contentless
+** table. Parameter bRowidModified is true if the UPDATE statement modifies
+** the rowid value. Parameter apVal[] contains the new values for each user
+** defined column of the fts5 table. pConfig is the configuration object of the
+** table being updated (guaranteed to be contentless). The contentless_delete=1
+** and contentless_unindexed=1 options may or may not be set. 
+**
+** This function returns SQLITE_OK if the UPDATE can go ahead, or an SQLite
+** error code if it cannot. In this case an error message is also loaded into
+** pConfig. Output parameter (*pbContent) is set to true if the caller should
+** update the %_content table only - not the FTS index or any other shadow
+** table. This occurs when an UPDATE modifies only UNINDEXED columns of the
+** table.
+**
+** An UPDATE may proceed if:
+**
+**   * The only columns modified are UNINDEXED columns, or
+**
+**   * The contentless_delete=1 option was specified and all of the indexed
+**     columns (not a subset) have been modified.
+*/
+static int fts5ContentlessUpdate(
+  Fts5Config *pConfig,
+  sqlite3_value **apVal,
+  int bRowidModified,
+  int *pbContent
+){
+  int ii;
+  int bSeenIndex = 0;             /* Have seen modified indexed column */
+  int bSeenIndexNC = 0;           /* Have seen unmodified indexed column */
+  int rc = SQLITE_OK;
+
+  for(ii=0; ii<pConfig->nCol; ii++){
+    if( pConfig->abUnindexed[ii]==0 ){
+      if( sqlite3_value_nochange(apVal[ii]) ){
+        bSeenIndexNC++;
+      }else{
+        bSeenIndex++;
+      }
+    }
+  }
+
+  if( bSeenIndex==0 && bRowidModified==0 ){
+    *pbContent = 1;
+  }else{
+    if( bSeenIndexNC || pConfig->bContentlessDelete==0 ){
+      rc = SQLITE_ERROR;
+      sqlite3Fts5ConfigErrmsg(pConfig, 
+          (pConfig->bContentlessDelete ?
+          "%s a subset of columns on fts5 contentless-delete table: %s" :
+          "%s contentless fts5 table: %s")
+          , "cannot UPDATE", pConfig->zName
+      );
+    }
+  }
+
+  return rc;
+}
+
 /* 
 ** This function is the implementation of the xUpdate callback used by 
 ** FTS3 virtual tables. It is invoked by SQLite each time a row is to be
@@ -1889,25 +1956,20 @@ static int fts5UpdateMethod(
     assert( eType0==SQLITE_INTEGER || eType0==SQLITE_NULL );
     assert( nArg!=1 || eType0==SQLITE_INTEGER );
 
-    /* Filter out attempts to run UPDATE or DELETE on contentless tables.
-    ** This is not suported. Except - they are both supported if the CREATE
-    ** VIRTUAL TABLE statement contained "contentless_delete=1". */
-    if( eType0==SQLITE_INTEGER 
-     && pConfig->eContent==FTS5_CONTENT_NONE 
-     && pConfig->bContentlessDelete==0
-    ){
-      pTab->p.base.zErrMsg = sqlite3_mprintf(
-          "cannot %s contentless fts5 table: %s", 
-          (nArg>1 ? "UPDATE" : "DELETE from"), pConfig->zName
-      );
-      rc = SQLITE_ERROR;
-    }
-
     /* DELETE */
-    else if( nArg==1 ){
-      i64 iDel = sqlite3_value_int64(apVal[0]);  /* Rowid to delete */
-      rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, 0, 0);
-      bUpdateOrDelete = 1;
+    if( nArg==1 ){
+      /* It is only possible to DELETE from a contentless table if the
+      ** contentless_delete=1 flag is set. */
+      if( fts5IsContentless(pTab, 1) && pConfig->bContentlessDelete==0 ){
+        fts5SetVtabError(pTab, 
+            "cannot DELETE from contentless fts5 table: %s", pConfig->zName
+        );
+        rc = SQLITE_ERROR;
+      }else{
+        i64 iDel = sqlite3_value_int64(apVal[0]);  /* Rowid to delete */
+        rc = sqlite3Fts5StorageDelete(pTab->pStorage, iDel, 0, 0);
+        bUpdateOrDelete = 1;
+      }
     }
 
     /* INSERT or UPDATE */
@@ -1941,35 +2003,55 @@ static int fts5UpdateMethod(
 
       /* UPDATE */
       else{
+        Fts5Storage *pStorage = pTab->pStorage;
         i64 iOld = sqlite3_value_int64(apVal[0]);  /* Old rowid */
         i64 iNew = sqlite3_value_int64(apVal[1]);  /* New rowid */
+        int bContent = 0;         /* Content only update */
+
+        /* If this is a contentless table (including contentless_unindexed=1
+        ** tables), check if the UPDATE may proceed.  */
+        if( fts5IsContentless(pTab, 1) ){
+          rc = fts5ContentlessUpdate(pConfig, &apVal[2], iOld!=iNew, &bContent);
+          if( rc!=SQLITE_OK ) goto update_out;
+        }
+
         if( eType1!=SQLITE_INTEGER ){
           rc = SQLITE_MISMATCH;
         }else if( iOld!=iNew ){
+          assert( bContent==0 );
           if( eConflict==SQLITE_REPLACE ){
-            rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0, 1);
+            rc = sqlite3Fts5StorageDelete(pStorage, iOld, 0, 1);
             if( rc==SQLITE_OK ){
-              rc = sqlite3Fts5StorageDelete(pTab->pStorage, iNew, 0, 0);
+              rc = sqlite3Fts5StorageDelete(pStorage, iNew, 0, 0);
             }
             fts5StorageInsert(&rc, pTab, apVal, pRowid);
           }else{
-            rc = sqlite3Fts5StorageFindDeleteRow(pTab->pStorage, iOld);
+            rc = sqlite3Fts5StorageFindDeleteRow(pStorage, iOld);
             if( rc==SQLITE_OK ){
-              rc = sqlite3Fts5StorageContentInsert(pTab->pStorage,apVal,pRowid);
+              rc = sqlite3Fts5StorageContentInsert(pStorage, 0, apVal, pRowid);
             }
             if( rc==SQLITE_OK ){
-              rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0, 1);
+              rc = sqlite3Fts5StorageDelete(pStorage, iOld, 0, 0);
             }
             if( rc==SQLITE_OK ){
-              rc = sqlite3Fts5StorageIndexInsert(pTab->pStorage, apVal,*pRowid);
+              rc = sqlite3Fts5StorageIndexInsert(pStorage, apVal, *pRowid);
             }
           }
+        }else if( bContent ){
+          /* This occurs when an UPDATE on a contentless table affects *only*
+          ** UNINDEXED columns. This is a no-op for contentless_unindexed=0
+          ** tables, or a write to the %_content table only for =1 tables.  */
+          assert( fts5IsContentless(pTab, 1) );
+          rc = sqlite3Fts5StorageFindDeleteRow(pStorage, iOld);
+          if( rc==SQLITE_OK ){
+            rc = sqlite3Fts5StorageContentInsert(pStorage, 1, apVal, pRowid);
+          }
         }else{
-          rc = sqlite3Fts5StorageDelete(pTab->pStorage, iOld, 0, 1);
+          rc = sqlite3Fts5StorageDelete(pStorage, iOld, 0, 1);
           fts5StorageInsert(&rc, pTab, apVal, pRowid);
         }
         bUpdateOrDelete = 1;
-        sqlite3Fts5StorageReleaseDeleteRow(pTab->pStorage);
+        sqlite3Fts5StorageReleaseDeleteRow(pStorage);
       }
 
     }
@@ -2170,7 +2252,7 @@ static int fts5ApiColumnText(
   assert( pCsr->ePlan!=FTS5_PLAN_SPECIAL );
   if( iCol<0 || iCol>=pTab->pConfig->nCol ){
     rc = SQLITE_RANGE;
-  }else if( fts5IsContentless((Fts5FullTable*)(pCsr->base.pVtab)) ){
+  }else if( fts5IsContentless((Fts5FullTable*)(pCsr->base.pVtab), 0) ){
     *pz = 0;
     *pn = 0;
   }else{
@@ -2203,7 +2285,7 @@ static int fts5CsrPoslist(
   if( iPhrase<0 || iPhrase>=sqlite3Fts5ExprPhraseCount(pCsr->pExpr) ){
     rc = SQLITE_RANGE;
   }else if( pConfig->eDetail!=FTS5_DETAIL_FULL 
-         && pConfig->eContent==FTS5_CONTENT_NONE 
+         && fts5IsContentless((Fts5FullTable*)pCsr->base.pVtab, 1)
   ){
     *pa = 0;
     *pn = 0;
@@ -2399,7 +2481,7 @@ static int fts5ApiColumnSize(Fts5Context *pCtx, int iCol, int *pnToken){
     if( pConfig->bColumnsize ){
       i64 iRowid = fts5CursorRowid(pCsr);
       rc = sqlite3Fts5StorageDocsize(pTab->pStorage, iRowid, pCsr->aColumnSize);
-    }else if( pConfig->zContent==0 ){
+    }else if( !pConfig->zContent || pConfig->eContent==FTS5_CONTENT_UNINDEXED ){
       int i;
       for(i=0; i<pConfig->nCol; i++){
         if( pConfig->abUnindexed[i]==0 ){
@@ -2687,7 +2769,7 @@ static int fts5ApiColumnLocale(
     rc = SQLITE_RANGE;
   }else if(
       pConfig->abUnindexed[iCol]==0
-   && pConfig->eContent!=FTS5_CONTENT_NONE
+   && 0==fts5IsContentless((Fts5FullTable*)pCsr->base.pVtab, 1)
    && pConfig->bLocale
   ){
     rc = fts5SeekCursor(pCsr, 0);
@@ -2962,16 +3044,7 @@ static int fts5ColumnMethod(
       }
     }
   }else{
-    /* A column created by the user containing values. */
-    int bNochange = sqlite3_vtab_nochange(pCtx);
-
-    if( fts5IsContentless(pTab) ){
-      if( bNochange && pConfig->bContentlessDelete ){
-        fts5ResultError(pCtx, "cannot UPDATE a subset of "
-            "columns on fts5 contentless-delete table: %s", pConfig->zName
-        );
-      }
-    }else if( bNochange==0 || pConfig->eContent!=FTS5_CONTENT_NORMAL ){
+    if( !sqlite3_vtab_nochange(pCtx) && pConfig->eContent!=FTS5_CONTENT_NONE ){
       pConfig->pzErrmsg = &pTab->p.base.zErrMsg;
       rc = fts5SeekCursor(pCsr, 1);
       if( rc==SQLITE_OK ){
diff --git a/ext/fts5/fts5_storage.c b/ext/fts5/fts5_storage.c
index e8649c703f..31f5fc5dc3 100644
--- a/ext/fts5/fts5_storage.c
+++ b/ext/fts5/fts5_storage.c
@@ -73,30 +73,6 @@ struct Fts5Storage {
 #define FTS5_STMT_REPLACE_CONFIG 10
 #define FTS5_STMT_SCAN           11
 
-/*
-** Return a pointer to a buffer obtained from sqlite3_malloc() that contains
-** nBind comma-separated question marks. e.g. if nBind is passed 5, this 
-** function returns "?,?,?,?,?".
-**
-** If *pRc is not SQLITE_OK when this function is called, it is a no-op and
-** NULL is returned immediately. Or, if the attempt to malloc a buffer
-** fails, then *pRc is set to SQLITE_NOMEM and NULL is returned. Otherwise,
-** if it is SQLITE_OK when this function is called and the malloc() succeeds,
-** *pRc is left unchanged.
-*/
-static char *fts5BindingsList(int *pRc, int nBind){
-  char *zBind = sqlite3Fts5MallocZero(pRc, 1 + nBind*2);
-  if( zBind ){
-    int ii;
-    for(ii=0; ii<nBind; ii++){
-      zBind[ii*2] = '?';
-      zBind[ii*2 + 1] = ',';
-    }
-    zBind[ii*2-1] = '\0';
-  }
-  return zBind;
-}
-
 /*
 ** Prepare the two insert statements - Fts5Storage.pInsertContent and
 ** Fts5Storage.pInsertDocsize - if they have not already been prepared.
@@ -165,23 +141,37 @@ static int fts5StorageGetStmt(
         );
         break;
 
-      case FTS5_STMT_INSERT_CONTENT: {
-        int nCol = 0;
-        char *zBind;
+      case FTS5_STMT_INSERT_CONTENT: 
+      case FTS5_STMT_REPLACE_CONTENT: {
+        char *zBind = 0;
         int i;
 
-        nCol = 1 + pC->nCol;
-        if( pC->bLocale ){
-          for(i=0; i<pC->nCol; i++){
-            if( pC->abUnindexed[i]==0 ) nCol++;
+        assert( pC->eContent==FTS5_CONTENT_NORMAL 
+             || pC->eContent==FTS5_CONTENT_UNINDEXED 
+        );
+
+        /* Add bindings for the "c*" columns - those that store the actual
+        ** table content. If eContent==NORMAL, then there is one binding
+        ** for each column. Or, if eContent==UNINDEXED, then there are only
+        ** bindings for the UNINDEXED columns. */
+        for(i=0; rc==SQLITE_OK && i<(pC->nCol+1); i++){
+          if( !i || pC->eContent==FTS5_CONTENT_NORMAL || pC->abUnindexed[i-1] ){
+            zBind = sqlite3Fts5Mprintf(&rc, "%z%s?%d", zBind, zBind?",":"",i+1);
           }
         }
 
-        zBind = fts5BindingsList(&rc, nCol);
-        if( zBind ){
-          zSql = sqlite3_mprintf(azStmt[eStmt], pC->zDb, pC->zName, zBind);
-          sqlite3_free(zBind);
+        /* Add bindings for any "l*" columns. Only non-UNINDEXED columns
+        ** require these.  */
+        if( pC->bLocale && pC->eContent==FTS5_CONTENT_NORMAL ){
+          for(i=0; rc==SQLITE_OK && i<pC->nCol; i++){
+            if( pC->abUnindexed[i]==0 ){
+              zBind = sqlite3Fts5Mprintf(&rc, "%z,?%d", zBind, pC->nCol+i+2);
+            }
+          }
         }
+
+        zSql = sqlite3Fts5Mprintf(&rc, azStmt[eStmt], pC->zDb, pC->zName,zBind);
+        sqlite3_free(zBind);
         break;
       }
 
@@ -367,7 +357,9 @@ int sqlite3Fts5StorageOpen(
   p->pIndex = pIndex;
 
   if( bCreate ){
-    if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+    if( pConfig->eContent==FTS5_CONTENT_NORMAL 
+     || pConfig->eContent==FTS5_CONTENT_UNINDEXED 
+    ){
       int nDefn = 32 + pConfig->nCol*10;
       char *zDefn = sqlite3_malloc64(32 + (sqlite3_int64)pConfig->nCol * 20);
       if( zDefn==0 ){
@@ -378,8 +370,12 @@ int sqlite3Fts5StorageOpen(
         sqlite3_snprintf(nDefn, zDefn, "id INTEGER PRIMARY KEY");
         iOff = (int)strlen(zDefn);
         for(i=0; i<pConfig->nCol; i++){
-          sqlite3_snprintf(nDefn-iOff, &zDefn[iOff], ", c%d", i);
-          iOff += (int)strlen(&zDefn[iOff]);
+          if( pConfig->eContent==FTS5_CONTENT_NORMAL 
+           || pConfig->abUnindexed[i] 
+          ){
+            sqlite3_snprintf(nDefn-iOff, &zDefn[iOff], ", c%d", i);
+            iOff += (int)strlen(&zDefn[iOff]);
+          }
         }
         if( pConfig->bLocale ){
           for(i=0; i<pConfig->nCol; i++){
@@ -617,7 +613,9 @@ static int fts5StorageContentlessDelete(Fts5Storage *p, i64 iDel){
   int rc = SQLITE_OK;
 
   assert( p->pConfig->bContentlessDelete );
-  assert( p->pConfig->eContent==FTS5_CONTENT_NONE );
+  assert( p->pConfig->eContent==FTS5_CONTENT_NONE
+       || p->pConfig->eContent==FTS5_CONTENT_UNINDEXED
+  );
 
   /* Look up the origin of the document in the %_docsize table. Store
   ** this in stack variable iOrigin.  */
@@ -741,6 +739,12 @@ int sqlite3Fts5StorageDelete(
   if( rc==SQLITE_OK ){
     if( p->pConfig->bContentlessDelete ){
       rc = fts5StorageContentlessDelete(p, iDel);
+      if( rc==SQLITE_OK 
+       && bSaveRow 
+       && p->pConfig->eContent==FTS5_CONTENT_UNINDEXED
+      ){
+        rc = sqlite3Fts5StorageFindDeleteRow(p, iDel);
+      }
     }else{
       rc = fts5StorageDeleteFromIndex(p, iDel, apVal, bSaveRow);
     }
@@ -757,7 +761,9 @@ int sqlite3Fts5StorageDelete(
   }
 
   /* Delete the %_content record */
-  if( pConfig->eContent==FTS5_CONTENT_NORMAL ){
+  if( pConfig->eContent==FTS5_CONTENT_NORMAL 
+   || pConfig->eContent==FTS5_CONTENT_UNINDEXED 
+  ){
     if( rc==SQLITE_OK ){
       rc = fts5StorageGetStmt(p, FTS5_STMT_DELETE_CONTENT, &pDel, 0);
     }
@@ -789,8 +795,13 @@ int sqlite3Fts5StorageDeleteAll(Fts5Storage *p){
   );
   if( rc==SQLITE_OK && pConfig->bColumnsize ){
     rc = fts5ExecPrintf(pConfig->db, 0,
-        "DELETE FROM %Q.'%q_docsize';",
-        pConfig->zDb, pConfig->zName
+        "DELETE FROM %Q.'%q_docsize';", pConfig->zDb, pConfig->zName
+    );
+  }
+
+  if( rc==SQLITE_OK && pConfig->eContent==FTS5_CONTENT_UNINDEXED ){
+    rc = fts5ExecPrintf(pConfig->db, 0,
+        "DELETE FROM %Q.'%q_content';", pConfig->zDb, pConfig->zName
     );
   }
 
@@ -926,6 +937,7 @@ static int fts5StorageNewRowid(Fts5Storage *p, i64 *piRowid){
 */
 int sqlite3Fts5StorageContentInsert(
   Fts5Storage *p, 
+  int bReplace,                   /* True to use REPLACE instead of INSERT */
   sqlite3_value **apVal, 
   i64 *piRowid
 ){
@@ -933,7 +945,9 @@ int sqlite3Fts5StorageContentInsert(
   int rc = SQLITE_OK;
 
   /* Insert the new row into the %_content table. */
-  if( pConfig->eContent!=FTS5_CONTENT_NORMAL ){
+  if( pConfig->eContent!=FTS5_CONTENT_NORMAL 
+   && pConfig->eContent!=FTS5_CONTENT_UNINDEXED
+  ){
     if( sqlite3_value_type(apVal[1])==SQLITE_INTEGER ){
       *piRowid = sqlite3_value_int64(apVal[1]);
     }else{
@@ -942,8 +956,10 @@ int sqlite3Fts5StorageContentInsert(
   }else{
     sqlite3_stmt *pInsert = 0;    /* Statement to write %_content table */
     int i;                        /* Counter variable */
-    int nIndexed = 0;             /* Number indexed columns seen */
-    rc = fts5StorageGetStmt(p, FTS5_STMT_INSERT_CONTENT, &pInsert, 0);
+
+    assert( FTS5_STMT_INSERT_CONTENT+1==FTS5_STMT_REPLACE_CONTENT );
+    assert( bReplace==0 || bReplace==1 );
+    rc = fts5StorageGetStmt(p, FTS5_STMT_INSERT_CONTENT+bReplace, &pInsert, 0);
     if( pInsert ) sqlite3_clear_bindings(pInsert);
 
     /* Bind the rowid value */
@@ -953,38 +969,39 @@ int sqlite3Fts5StorageContentInsert(
     ** user-defined column. As is column 1 of pSavedRow.  */
     for(i=2; rc==SQLITE_OK && i<=pConfig->nCol+1; i++){
       int bUnindexed = pConfig->abUnindexed[i-2];
-      sqlite3_value *pVal = apVal[i];
+      if( pConfig->eContent==FTS5_CONTENT_NORMAL || bUnindexed ){
+        sqlite3_value *pVal = apVal[i];
 
-      nIndexed += !bUnindexed;
-      if( sqlite3_value_nochange(pVal) && p->pSavedRow ){
-        /* This is an UPDATE statement, and column (i-2) was not modified.
-        ** Retrieve the value from Fts5Storage.pSavedRow instead. */
-        pVal = sqlite3_column_value(p->pSavedRow, i-1);
-        if( pConfig->bLocale && bUnindexed==0 ){
-          sqlite3_bind_value(pInsert, pConfig->nCol + 1 + nIndexed,
-              sqlite3_column_value(p->pSavedRow, pConfig->nCol + i - 1)
-          );
-        }
-      }else if( sqlite3Fts5IsLocaleValue(pConfig, pVal) ){
-        const char *pText = 0;
-        const char *pLoc = 0;
-        int nText = 0;
-        int nLoc = 0;
-        assert( pConfig->bLocale );
-
-        rc = sqlite3Fts5DecodeLocaleValue(pVal, &pText, &nText, &pLoc, &nLoc);
-        if( rc==SQLITE_OK ){
-          sqlite3_bind_text(pInsert, i, pText, nText, SQLITE_TRANSIENT);
-          if( bUnindexed==0 ){
-            int iLoc = pConfig->nCol + 1 + nIndexed;
-            sqlite3_bind_text(pInsert, iLoc, pLoc, nLoc, SQLITE_TRANSIENT);
+        if( sqlite3_value_nochange(pVal) && p->pSavedRow ){
+          /* This is an UPDATE statement, and user-defined column (i-2) was not
+          ** modified.  Retrieve the value from Fts5Storage.pSavedRow.  */
+          pVal = sqlite3_column_value(p->pSavedRow, i-1);
+          if( pConfig->bLocale && bUnindexed==0 ){
+            sqlite3_bind_value(pInsert, pConfig->nCol + i,
+                sqlite3_column_value(p->pSavedRow, pConfig->nCol + i - 1)
+            );
           }
+        }else if( sqlite3Fts5IsLocaleValue(pConfig, pVal) ){
+          const char *pText = 0;
+          const char *pLoc = 0;
+          int nText = 0;
+          int nLoc = 0;
+          assert( pConfig->bLocale );
+
+          rc = sqlite3Fts5DecodeLocaleValue(pVal, &pText, &nText, &pLoc, &nLoc);
+          if( rc==SQLITE_OK ){
+            sqlite3_bind_text(pInsert, i, pText, nText, SQLITE_TRANSIENT);
+            if( bUnindexed==0 ){
+              int iLoc = pConfig->nCol + i;
+              sqlite3_bind_text(pInsert, iLoc, pLoc, nLoc, SQLITE_TRANSIENT);
+            }
+          }
+
+          continue;
         }
 
-        continue;
+        rc = sqlite3_bind_value(pInsert, i, pVal);
       }
-
-      rc = sqlite3_bind_value(pInsert, i, pVal);
     }
     if( rc==SQLITE_OK ){
       sqlite3_step(pInsert);
diff --git a/ext/fts5/test/fts5contentless5.test b/ext/fts5/test/fts5contentless5.test
index 3563678868..86d0753286 100644
--- a/ext/fts5/test/fts5contentless5.test
+++ b/ext/fts5/test/fts5contentless5.test
@@ -35,8 +35,8 @@ do_execsql_test 1.01 {
 }
 
 # explain_i "UPDATE t1 SET a='a' WHERE t1.rowid=1"    
-breakpoint
-explain_i "UPDATE t1 SET a='a' FROM t2 WHERE t1.rowid=1 AND b IS NULL"     
+#breakpoint
+#explain_i "UPDATE t1 SET a='a' FROM t2 WHERE t1.rowid=1 AND b IS NULL"     
 
 #breakpoint
 #explain_i "UPDATE t1 SET a='a' WHERE b IS NULL AND rowid=?"
@@ -56,4 +56,56 @@ foreach {tn up err} {
   do_catchsql_test 1.$tn $up $res($err)
 }
 
+#-------------------------------------------------------------------------
+reset_db
+
+proc random {n} { expr {abs(int(rand()*$n))} }
+proc select_one {list} {
+  set n [llength $list]
+  lindex $list [random $n]
+}
+proc vocab {} {
+  list abc def ghi jkl mno pqr stu vwx yza
+}
+proc term {} {
+  select_one [vocab]
+}
+proc document {} {
+  set nTerm [expr [random 3] + 7]
+  set doc ""
+  for {set ii 0} {$ii < $nTerm} {incr ii} {
+    lappend doc [term]
+  }
+  set doc
+}
+db func document document
+
+do_execsql_test 2.0 {
+  CREATE VIRTUAL TABLE ft USING fts5(a, contentless_delete=1, content='');
+  INSERT INTO ft(ft, rank) VALUES('pgsz', 64);
+}
+
+do_test 2.1 {
+  for {set ii 1} {$ii < 12} {incr ii} {
+    db transaction {
+      for {set jj 0} {$jj < 10} {incr jj} {
+        set doc [document]
+        execsql { INSERT INTO ft VALUES($doc); }
+      }
+    }
+  }
+} {}
+
+do_test 2.2 {
+  foreach r [db eval {SELECT rowid FROM ft}] {
+    execsql { DELETE FROM ft WHERE rowid=$r }
+  }
+} {}
+
+set doc [document]
+do_execsql_test 2.3 {
+  INSERT INTO ft VALUES($doc)
+}
+
+
 finish_test
diff --git a/ext/fts5/test/fts5delete.test b/ext/fts5/test/fts5delete.test
index 1214fec4f4..024f89594c 100644
--- a/ext/fts5/test/fts5delete.test
+++ b/ext/fts5/test/fts5delete.test
@@ -113,5 +113,58 @@ do_execsql_test 3.4 {
   INSERT INTO tx(tx) VALUES('integrity-check');
 }
 
+#-------------------------------------------------------------------------
+reset_db
+do_execsql_test 4.0 {
+  CREATE VIRTUAL TABLE ft1 USING fts5(a, b UNINDEXED, 
+      content='', contentless_unindexed=1
+  );
+  CREATE VIRTUAL TABLE ft2 USING fts5(a, b UNINDEXED, 
+      content='', contentless_unindexed=1, contentless_delete=1
+  );
+
+  INSERT INTO ft1(rowid, a, b) VALUES(1, 'one', 'i');
+  INSERT INTO ft1(rowid, a, b) VALUES(2, 'two', 'ii');
+  INSERT INTO ft1(rowid, a, b) VALUES(3, 'three', 'iii');
+  INSERT INTO ft2(rowid, a, b) VALUES(1, 'one', 'i');
+  INSERT INTO ft2(rowid, a, b) VALUES(2, 'two', 'ii');
+  INSERT INTO ft2(rowid, a, b) VALUES(3, 'three', 'iii');
+}
+
+do_catchsql_test 4.1 {
+  DELETE FROM ft1 WHERE rowid=2
+} {1 {cannot DELETE from contentless fts5 table: ft1}}
+do_catchsql_test 4.2 {
+  DELETE FROM ft2 WHERE rowid=2
+} {0 {}}
+
+do_catchsql_test 4.3 {
+  INSERT INTO ft1(ft1, rowid, a) VALUES('delete', 2, 'two');
+} {0 {}}
+do_catchsql_test 4.2 {
+  INSERT INTO ft2(ft2, rowid, a) VALUES('delete', 2, 'two');
+} {1 {'delete' may not be used with a contentless_delete=1 table}}
+
+do_execsql_test 4.3 {
+  SELECT rowid, * FROM ft1;
+} {
+  1 {} i
+  3 {} iii
+}
+do_execsql_test 4.4 {
+  SELECT rowid, * FROM ft2;
+} {
+  1 {} i
+  3 {} iii
+}
+
+do_execsql_test 4.5 {
+  SELECT * FROM ft1_content
+} {1 i 3 iii}
+
+do_execsql_test 4.6 {
+  SELECT * FROM ft2_content
+} {1 i 3 iii}
+
 finish_test
 
diff --git a/ext/fts5/test/fts5unindexed2.test b/ext/fts5/test/fts5unindexed2.test
new file mode 100644
index 0000000000..c0abfc3980
--- /dev/null
+++ b/ext/fts5/test/fts5unindexed2.test
@@ -0,0 +1,297 @@
+# 2024 Sep 13
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# The tests in this file focus on "unindexed" columns in contentless 
+# tables.
+#
+
+source [file join [file dirname [info script]] fts5_common.tcl]
+set testprefix fts5unindexed2
+
+# If SQLITE_ENABLE_FTS5 is not defined, omit this file.
+ifcapable !fts5 {
+  finish_test
+  return
+}
+
+
+do_execsql_test 1.1 {
+  CREATE VIRTUAL TABLE t1 USING fts5(
+      a, b UNINDEXED, content=, contentless_unindexed=1
+  );
+} {}
+
+do_execsql_test 1.2 {
+  INSERT INTO t1 VALUES('abc def', 'ghi jkl');
+}
+
+do_execsql_test 1.3 {
+  SELECT rowid, a, b FROM t1
+} {1 {} {ghi jkl}}
+
+do_execsql_test 1.4 {
+  INSERT INTO t1(rowid, a, b) VALUES(11, 'hello world', 'one two three');
+}
+
+do_execsql_test 1.5 {
+  INSERT INTO t1(t1, rowid, a, b) VALUES('delete', 1, 'abc def', 'ghi jkl');
+}
+
+do_execsql_test 1.6 {
+  SELECT rowid, a, b FROM t1
+} {
+  11 {} {one two three}
+}
+
+do_execsql_test 1.7 {
+  PRAGMA integrity_check
+} {ok}
+
+do_execsql_test 1.8 {
+  INSERT INTO t1(rowid, a, b) VALUES(12, 'abc def', 'ghi jkl');
+}
+
+do_execsql_test 1.9 {
+  SELECT rowid, a, b FROM t1('def')
+} {12 {} {ghi jkl}}
+
+do_execsql_test 1.10 {
+  SELECT rowid, a, b FROM t1('def OR hello') ORDER BY rank
+} {11 {} {one two three} 12 {} {ghi jkl}}
+
+do_execsql_test 1.11 {
+  SELECT rowid, a, b FROM t1 WHERE rowid=11
+} {11 {} {one two three}}
+
+do_execsql_test 1.12 {
+  SELECT rowid, a, b FROM t1
+} {11 {} {one two three} 12 {} {ghi jkl}}
+
+
+fts5_aux_test_functions db
+do_execsql_test 1.12.2 {
+  SELECT rowid, fts5_test_columntext(t1) FROM t1('def OR hello')
+} {11 {{} {one two three}} 12 {{} {ghi jkl}}}
+
+do_execsql_test 1.13 {
+  INSERT INTO t1(t1) VALUES('delete-all');
+}
+
+do_execsql_test 1.14 {
+  SELECT rowid, a, b FROM t1
+} 
+
+do_execsql_test 1.15 {
+  PRAGMA integrity_check
+} {ok}
+
+do_execsql_test 2.0 {
+  CREATE VIRTUAL TABLE t4 USING fts5(
+      x, y UNINDEXED, z, columnsize=0, content='', contentless_unindexed=1
+  );
+}
+
+do_execsql_test 2.1 {
+  INSERT INTO t4(rowid, x, y, z) VALUES(1, 'a a', 'b b b', 'c');
+}
+
+#-------------------------------------------------------------------------
+reset_db
+
+do_execsql_test 3.0 {
+  CREATE VIRTUAL TABLE x1 USING fts5(
+      a UNINDEXED, b, c UNINDEXED, d, content=, contentless_delete=1,
+      contentless_unindexed=1
+  );
+}
+
+do_execsql_test 3.1 {
+  INSERT INTO x1(rowid, a, b, c, d) VALUES(131, 'aaa', 'bbb', 'ccc', 'ddd');
+}
+
+do_execsql_test 3.2 {
+  SELECT * FROM x1
+} {aaa {} ccc {}}
+
+do_execsql_test 3.3 {
+  INSERT INTO x1(rowid, a, b, c, d) VALUES(1000, 'AAA', 'BBB', 'CCC', 'DDD');
+}
+
+do_execsql_test 3.4 {
+  SELECT rowid, * FROM x1
+} {
+  131 aaa {} ccc {}
+  1000 AAA {} CCC {}
+}
+
+do_execsql_test 3.5 {
+  DELETE FROM x1 WHERE rowid=131;
+  SELECT rowid, * FROM x1
+} {
+  1000 AAA {} CCC {}
+}
+
+do_execsql_test 3.6 {
+  INSERT INTO x1(rowid, a, b, c, d) VALUES(112, 'aaa', 'bbb', 'ccc', 'ddd');
+  SELECT rowid, * FROM x1
+} {
+  112 aaa {} ccc {}
+  1000 AAA {} CCC {}
+}
+
+do_execsql_test 3.7 {
+  UPDATE x1 SET b='hello', d='world', rowid=1120 WHERE rowid=112
+}
+
+do_execsql_test 3.8 {
+  SELECT rowid, * FROM x1
+} {
+  1000 AAA {} CCC {}
+  1120 aaa {} ccc {}
+}
+
+do_execsql_test 3.9 {
+  SELECT rowid, * FROM x1('hello');
+} {
+  1120 aaa {} ccc {}
+}
+
+do_execsql_test 3.9 {
+  SELECT rowid, * FROM x1('bbb');
+} {
+  1000 AAA {} CCC {}
+}
+
+fts5_aux_test_functions db
+do_execsql_test 3.10 {
+  SELECT rowid, fts5_test_columntext(x1) FROM x1('b*')
+} {1000 {AAA {} CCC {}}}
+
+#-------------------------------------------------------------------------
+# Check that if contentless_unindexed=1 is not specified, the values
+# of UNINDEXED columns are not stored in the database.
+#
+# Also check that contentless_unindexed=1 is not allowed unless the table
+# is actually contentless.
+#
+reset_db
+do_execsql_test 4.0 {
+  CREATE VIRTUAL TABLE ft USING fts5(a, b, c UNINDEXED, content='');
+  INSERT INTO ft VALUES('one', 'two', 'three');
+  SELECT rowid, * FROM ft;
+} {1 {} {} {}}
+
+do_execsql_test 4.1 {
+  SELECT name FROM sqlite_schema ORDER BY 1
+} {
+  ft ft_config ft_data ft_docsize ft_idx
+}
+
+do_catchsql_test 4.2 {
+  CREATE VIRTUAL TABLE ft2 USING fts5(
+      a, b, c UNINDEXED, contentless_unindexed=1
+  );
+} {1 {contentless_unindexed=1 requires a contentless table}}
+
+do_catchsql_test 4.3 {
+  DELETE FROM ft WHERE rowid=1
+} {1 {cannot DELETE from contentless fts5 table: ft}}
+
+#-------------------------------------------------------------------------
+# Check that the usual restrictions on contentless tables apply to 
+# contentless_unindexed=1 tables.
+#
+reset_db
+do_execsql_test 5.0 {
+  CREATE VIRTUAL TABLE ft USING fts5(
+      a, b UNINDEXED, c, content='', contentless_unindexed=1
+  );
+  INSERT INTO ft VALUES('one', 'two', 'three');
+  INSERT INTO ft VALUES('four', 'five', 'six');
+  INSERT INTO ft VALUES('seven', 'eight', 'nine');
+  SELECT rowid, * FROM ft;
+} {
+  1 {} two {}
+  2 {} five {}
+  3 {} eight {}
+}
+
+do_execsql_test 5.1 {
+  PRAGMA integrity_check
+} {ok}
+
+do_catchsql_test 5.2 {
+  DELETE FROM ft WHERE rowid=2
+} {1 {cannot DELETE from contentless fts5 table: ft}}
+
+do_execsql_test 5.3 {
+  SELECT rowid, * FROM ft('six')
+} {
+  2 {} five {}
+}
+
+do_catchsql_test 5.4 {
+  UPDATE ft SET a='x', b='y', c='z' WHERE rowid=3
+} {1 {cannot UPDATE contentless fts5 table: ft}}
+
+fts5_aux_test_functions db
+
+do_execsql_test 5.5 {
+  SELECT fts5_test_columntext(ft) FROM ft WHERE rowid=3
+} {
+  {{} eight {}}
+}
+do_execsql_test 5.6 {
+  SELECT fts5_test_columntext(ft) FROM ft('three');
+} {
+  {{} two {}}
+}
+
+#-------------------------------------------------------------------------
+# Check that it is possible to UPDATE a contentless_unindexed=1 table
+# if the only columns being modified are UNINDEXED.
+#
+# If the contentless_unindexed=1 table is also contentless_delete=1, then
+# it is also possible to update indexed columns - but only if *all* indexed
+# columns are updated.
+#
+reset_db
+do_execsql_test 6.0 {
+  CREATE VIRTUAL TABLE ft1 USING fts5(a, b UNINDEXED, c UNINDEXED, d,
+      contentless_unindexed=1, content=''
+  );
+
+  INSERT INTO ft1(rowid, a, b, c, d) VALUES
+      (100, 'x y', 'b1', 'c1', 'a b'),
+      (200, 'c d', 'b2', 'c2', 'a b'),
+      (300, 'e f', 'b3', 'c3', 'a b');
+}
+
+do_execsql_test 6.1 {
+  UPDATE ft1 SET b='b1.1', c='c1.1' WHERE rowid=100;
+}
+do_execsql_test 6.2 {
+  UPDATE ft1 SET b='b2.1' WHERE rowid=200;
+}
+do_execsql_test 6.3 {
+  UPDATE ft1 SET c='c3.1' WHERE rowid=300;
+}
+
+do_execsql_test 6.4 {
+  SELECT rowid, a, b, c, d FROM ft1
+} {
+  100 {} b1.1 c1.1 {}
+  200 {} b2.1 c2 {}
+  300 {} b3 c3.1 {}
+}
+
+finish_test
+
diff --git a/ext/fts5/test/fts5update2.test b/ext/fts5/test/fts5update2.test
new file mode 100644
index 0000000000..d04af4800d
--- /dev/null
+++ b/ext/fts5/test/fts5update2.test
@@ -0,0 +1,177 @@
+# 2024 Sep 27
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#*************************************************************************
+# This file implements regression tests for SQLite library.  The
+# focus of this script is testing the FTS5 module.
+#
+
+source [file join [file dirname [info script]] fts5_common.tcl]
+set testprefix fts5update2
+
+# If SQLITE_ENABLE_FTS5 is not defined, omit this file.
+ifcapable !fts5 {
+  finish_test
+  return
+}
+
+
+#-------------------------------------------------------------------------
+# Test that the various types of UPDATE statement are handled correctly
+# by different table types.
+#
+foreach_detail_mode $testprefix {
+foreach {tn cu} {
+  1 0
+  2 1
+} {
+  reset_db
+  do_execsql_test 1.$tn.1 "
+    CREATE VIRTUAL TABLE ft1 USING fts5(a, b UNINDEXED, c UNINDEXED, d,
+        content='',
+        contentless_unindexed=$cu,
+        detail=%DETAIL%
+    );
+    CREATE VIRTUAL TABLE ft2 USING fts5(a, b UNINDEXED, c UNINDEXED, d,
+        content='',
+        contentless_unindexed=$cu, contentless_delete=1,
+        detail=%DETAIL%
+    );
+  "
+
+  do_execsql_test 1.$tn.2 {
+    INSERT INTO ft1(rowid, a, b, c, d) VALUES(1, 'a1', 'b1', 'c1', 'd1');
+    INSERT INTO ft1(rowid, a, b, c, d) VALUES(2, 'a2', 'b2', 'c2', 'd2');
+    INSERT INTO ft1(rowid, a, b, c, d) VALUES(3, 'a3', 'b3', 'c3', 'd3');
+
+    INSERT INTO ft2(rowid, a, b, c, d) VALUES(1, 'a1', 'b1', 'c1', 'd1');
+    INSERT INTO ft2(rowid, a, b, c, d) VALUES(2, 'a2', 'b2', 'c2', 'd2');
+    INSERT INTO ft2(rowid, a, b, c, d) VALUES(3, 'a3', 'b3', 'c3', 'd3');
+  }
+
+  # It should be possible to update a subset of the UNINDEXED columns of
+  # a contentless table. Regardless of whether or not contentless_unindexed=1
+  # or contentless_delete=1 is set.
+  do_execsql_test 1.$tn.3 {
+    UPDATE ft1 SET b=b||'.1';
+    UPDATE ft2 SET b=b||'.1';
+  }
+  do_execsql_test 1.$tn.4 {
+    UPDATE ft1 SET b=b||'.2', c=c||'.2';
+    UPDATE ft2 SET b=b||'.2', c=c||'.2';
+  }
+
+  set res(0) {
+    1 {} {} {} {}
+    2 {} {} {} {}
+    3 {} {} {} {}
+  }
+  set res(1) {
+    1 {} b1.1.2 c1.2 {}
+    2 {} b2.1.2 c2.2 {}
+    3 {} b3.1.2 c3.2 {}
+  }
+
+  do_execsql_test 1.$tn.5 {
+    SELECT rowid, * FROM ft2
+  } $res($cu)
+
+  do_execsql_test 1.6.1 { SELECT rowid FROM ft1('a2') } {2}
+  do_execsql_test 1.6.2 { SELECT rowid FROM ft2('a2') } {2}
+
+  # It should be possible to update all indexed columns (but no other subset)
+  # if the contentless_delete=1 option is set, as it is for "ft2".
+  do_execsql_test 1.$tn.7 {
+    UPDATE ft2 SET a='a22', d='d22' WHERE rowid=2;
+  }
+  do_execsql_test 1.$tn.8 { SELECT rowid FROM ft2('a22 AND d22') } {2}
+
+  do_execsql_test 1.$tn.9 {
+    UPDATE ft2 SET a='a33', d='d33', b='b3' WHERE rowid=3;
+  }
+
+  set res(1) {
+    1 {} b1.1.2 c1.2 {}
+    2 {} b2.1.2 c2.2 {}
+    3 {} b3 c3.2 {}
+  }
+  do_execsql_test 1.$tn.10 {
+    SELECT rowid, * FROM ft2
+  } $res($cu)
+
+  do_catchsql_test 1.$tn.11 {
+    UPDATE ft2 SET a='a11' WHERE rowid=1
+  } {1 {cannot UPDATE a subset of columns on fts5 contentless-delete table: ft2}}
+  do_catchsql_test 1.$tn.12 {
+    UPDATE ft2 SET d='d11' WHERE rowid=1
+  } {1 {cannot UPDATE a subset of columns on fts5 contentless-delete table: ft2}}
+
+  # It is not possible to update the values of indexed columns if
+  # contentless_delete=1 is not set.
+  do_catchsql_test 1.$tn.13 {
+    UPDATE ft1 SET a='a11' WHERE rowid=1
+  } {1 {cannot UPDATE contentless fts5 table: ft1}}
+  do_catchsql_test 1.$tn.14 {
+    UPDATE ft1 SET d='d11' WHERE rowid=1
+  } {1 {cannot UPDATE contentless fts5 table: ft1}}
+
+  # It should be possible to update the rowid if contentless_delete=1 is
+  # set and all indexed columns are updated.
+  do_execsql_test 1.$tn.15 {
+    UPDATE ft2 SET a='aXone', d='dXone', rowid=11 WHERE rowid=1
+  } 
+
+  set res(0) {
+    2 {} {} {} {}
+    3 {} {} {} {}
+    11 {} {} {} {}
+  }
+  set res(1) {
+    2 {} b2.1.2 c2.2 {}
+    3 {} b3 c3.2 {}
+    11 {} b1.1.2 c1.2 {}
+  }
+  do_execsql_test 1.$tn.16 {
+    SELECT rowid, * FROM ft2
+  } $res($cu)
+
+  # Should not be possible to update the rowid of a contentless_delete=1
+  # table if no indexed columns are updated.
+  do_catchsql_test 1.$tn.17 {
+    UPDATE ft2 SET rowid=12 WHERE rowid=11
+  } {1 {cannot UPDATE a subset of columns on fts5 contentless-delete table: ft2}}
+  do_catchsql_test 1.$tn.18 {
+    UPDATE ft1 SET rowid=12 WHERE rowid=1
+  } {1 {cannot UPDATE contentless fts5 table: ft1}}
+
+  do_execsql_test 1.$tn.19 {
+    UPDATE ft2 SET a='aXtwo', d='dXtwo', c='newval', rowid=12 WHERE rowid=2
+  }  {}
+
+  set res(0) {
+    3 {} {} {} {}
+    11 {} {} {} {}
+    12 {} {} {} {}
+  }
+  set res(1) {
+    3 {} b3 c3.2 {}
+    11 {} b1.1.2 c1.2 {}
+    12 {} b2.1.2 newval {}
+  }
+  do_execsql_test 1.$tn.20 {
+    SELECT rowid, * FROM ft2
+  } $res($cu)
+
+  do_execsql_test 1.$tn.21 {
+    SELECT rowid, * FROM ft2('aXtwo AND dXtwo')
+  } [lrange $res($cu) 10 end]
+
+}} ;# end of [foreach_detail_mode] loop
+
+finish_test
diff --git a/ext/wasm/GNUmakefile b/ext/wasm/GNUmakefile
index d98a0cb8ed..00f1ee50a7 100644
--- a/ext/wasm/GNUmakefile
+++ b/ext/wasm/GNUmakefile
@@ -105,6 +105,10 @@ dir.dout := $(dir.wasm)/jswasm
 dir.tmp := $(dir.wasm)/bld
 dir.wasmfs := $(dir.dout)
 
+MKDIR.bld := $(dir.tmp)
+$(MKDIR.bld):
+	-mkdir -p $@ $(dir.dout)
+
 CLEAN_FILES += *~ $(dir.jacc)/*~ $(dir.api)/*~ $(dir.common)/*~ $(dir.fiddle)/*~ \
   $(dir.fiddle-debug)/* $(dir.dout)/* $(dir.tmp)/*
 
@@ -129,12 +133,14 @@ sqlite3.canonical.c := $(dir.top)/sqlite3.c
 sqlite3.c ?= $(firstword $(wildcard $(dir.top)/sqlite3-see.c) $(sqlite3.canonical.c))
 sqlite3.h := $(dir.top)/sqlite3.h
 
+ifneq (1,$(MAKING_CLEAN))
 ifeq (,$(shell grep sqlite3_activate_see $(sqlite3.c)))
   SQLITE_C_IS_SEE := 0
 else
   SQLITE_C_IS_SEE := 1
   $(info This is an SEE build)
 endif
+endif
 
 ########################################################################@
 # It's important that sqlite3.h be built to completion before any
@@ -145,11 +151,19 @@ $(sqlite3.h):
 	$(MAKE) -C $(dir.top) sqlite3.c
 $(sqlite3.c): $(sqlite3.h)
 
+########################################################################
+# Special-case builds for which we require certain pre-conditions
+# which, if not met, may cause warnings or fatal errors in the build.
+# This also affects the default optimization level flags. Note that
+# the fiddle targets are in this list because they are used for
+# generating sqlite.org/fiddle.
+OPTIMIZED_TARGETS := dist snapshot fiddle fiddle.debug
+
 ifneq (1,$(MAKING_CLEAN))
-  ifeq (,$(filter release snapshot,$(MAKECMDGOALS)))
+  ifeq (,$(filter $(OPTIMIZED_TARGETS),$(MAKECMDGOALS)))
     $(info ==============================================================)
-    $(info == Development build. Use 'release' or 'snapshot' target)
-    $(info == for a smaller release build.)
+    $(info == Development build. Make one of (dist, snapshot) for a)
+    $(info == smaller release build.)
     $(info ==============================================================)
   endif
 endif
@@ -193,11 +207,11 @@ else
     $(info WARNING: on Ubuntu-like systems it can be installed with:)
     $(info WARNING:    sudo apt install wabt)
     $(info WARNING: *******************************************************************)
+    ifneq (,$(filter $(OPTIMIZED_TARGETS),$(MAKECMDGOALS)))
+      $(error Cannot make release-quality binary because wasm-strip is not available.)
+    endif
     wasm-strip.bin := echo "not wasm-stripping"
   endif
-  ifneq (,$(filter release snapshot,$(MAKECMDGOALS)))
-    $(error Cannot make release-quality binary because wasm-strip is not available.)
-  endif
 endif
 maybe-wasm-strip := $(wasm-strip.bin)
 
@@ -237,6 +251,7 @@ SQLITE_OPT.common := \
 # to be able to run without this:
 SQLITE_OPT.common += -DSQLITE_WASM_ENABLE_C_TESTS
 
+# Extra flags for full-featured builds...
 SQLITE_OPT.full-featured := \
   -DSQLITE_ENABLE_BYTECODE_VTAB \
   -DSQLITE_ENABLE_DBPAGE_VTAB \
@@ -367,12 +382,12 @@ DISTCLEAN_FILES += $(bin.stripccomments)
 
 ########################################################################
 # bin.mkwb is used for generating some of the makefile code for the
-# various build builds. It used to be generated in this makefile via a
+# various wasm builds. It used to be generated in this makefile via a
 # difficult-to-read/maintain block of $(eval)'d code. Attempts were
 # made to generate it from tcl and bash (shell) but having to escape
 # the $ references in those languages made it just as illegible as the
 # native makefile code. Somewhat surprisingly, moving that code generation
-# to C makes it slightly less illegible than the previousq 3 options.
+# to C makes it slightly less illegible than the previous 3 options.
 bin.mkwb := ./mkwasmbuilds
 $(bin.mkwb): $(bin.mkwb).c $(MAKEFILE)
 	$(CC) -o $@ $<
@@ -443,7 +458,17 @@ emcc.WASM_BIGINT ?= 1
 # emcc_opt = optimization-related flags. These are primarily used by
 # the various oX targets. build times for -O levels higher than 0 are
 # painful at dev-time.
-emcc_opt ?= -O0
+#
+# When running any of the $(OPTIMIZED_TARGETS) explicitly, e.g. for a
+# release distribution, use a higher optimization level. Experience
+# has shown -Oz to produce the smallest deliverables with only a
+# roughly 10% performance hit in the resulting WASM file compared to
+# -O2 (which consistently creates the fastest-running deliverables).
+ifeq (,$(filter $(OPTIMIZED_TARGETS),$(MAKECMDGOALS)))
+  emcc_opt ?= -O0
+else
+  emcc_opt ?= -Oz
+endif
 
 # When passing emcc_opt from the CLI, += and re-assignment have no
 # effect, so emcc_opt+=-g3 doesn't work. So...
@@ -487,7 +512,7 @@ ifeq (0,$(wasm-bare-bones))
   EXPORTED_FUNCTIONS.api.in += $(dir.api)/EXPORTED_FUNCTIONS.sqlite3-extras
 endif
 EXPORTED_FUNCTIONS.api := $(dir.tmp)/EXPORTED_FUNCTIONS.api
-$(EXPORTED_FUNCTIONS.api): $(EXPORTED_FUNCTIONS.api.in) $(sqlite3.c) $(MAKEFILE)
+$(EXPORTED_FUNCTIONS.api): $(MKDIR.bld) $(EXPORTED_FUNCTIONS.api.in) $(sqlite3.c) $(MAKEFILE)
 	cat $(EXPORTED_FUNCTIONS.api.in) > $@
 
 ########################################################################
@@ -571,7 +596,7 @@ $(SOAP.js.bld): $(SOAP.js)
 # preprocessed. It contains all of $(sqlite3-api.jses) but none of the
 # Emscripten-specific headers and footers.
 sqlite3-api.js.in := $(dir.tmp)/sqlite3-api.c-pp.js
-$(sqlite3-api.js.in): $(sqlite3-api.jses) $(MAKEFILE)
+$(sqlite3-api.js.in): $(MKDIR.bld) $(sqlite3-api.jses) $(MAKEFILE)
 	@echo "Making $@..."
 	@for i in $(sqlite3-api.jses); do \
 		echo "/* BEGIN FILE: $$i */"; \
@@ -738,7 +763,7 @@ emcc.jsflags += -sLLD_REPORT_UNDEFINED
 ########################################################################
 # $(sqlite3-api-build-version.js) injects the build version info into
 # the bundle in JSON form.
-$(sqlite3-api-build-version.js): $(bin.version-info) $(MAKEFILE)
+$(sqlite3-api-build-version.js): $(MKDIR.bld) $(bin.version-info) $(MAKEFILE)
 	@echo "Making $@..."
 	@{ \
     echo 'globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){'; \
@@ -754,7 +779,7 @@ $(sqlite3-api-build-version.js): $(bin.version-info) $(MAKEFILE)
 #
 # Maintenance reminder: there are awk binaries out there which do not
 # support -e SCRIPT.
-$(sqlite3-license-version.js): $(sqlite3.h) $(sqlite3-license-version-header.js) \
+$(sqlite3-license-version.js): $(MKDIR.bld) $(sqlite3.h) $(sqlite3-license-version-header.js) \
   $(MAKEFILE)
 	@echo "Making $@..."; { \
     cat $(sqlite3-license-version-header.js); \
@@ -782,7 +807,7 @@ post-jses.js := \
   $(dir.api)/post-js-header.js \
   $(sqlite3-api.js.in) \
   $(dir.api)/post-js-footer.js
-$(post-js.js.in): $(post-jses.js) $(MAKEFILE)
+$(post-js.js.in): $(MKDIR.bld) $(post-jses.js) $(MAKEFILE)
 	@echo "Making $@..."
 	@for i in $(post-jses.js); do \
 		echo "/* BEGIN FILE: $$i */"; \
@@ -852,6 +877,7 @@ sqlite3-api-node.mjs := $(dir.dout)/sqlite3-api-node.mjs
 sqlite3-node.mjs := $(dir.dout)/sqlite3-node.mjs
 sqlite3-api-wasmfs.mjs := $(dir.tmp)/sqlite3-api-wasmfs.mjs
 sqlite3-wasmfs.mjs    := $(dir.wasmfs)/sqlite3-wasmfs.mjs
+EXPORTED_FUNCTIONS.fiddle := $(dir.tmp)/EXPORTED_FUNCTIONS.fiddle
 ifneq (1,$(MAKING_CLEAN))
 .wasmbuilds.make: $(bin.mkwb)
 	@rm -f $@
@@ -1010,7 +1036,7 @@ speedtest1.exit-runtime1 := -sEXIT_RUNTIME=1
 # -sEXIT_RUNTIME=1 but we need EXIT_RUNTIME=0 for the worker-based app
 # which runs speedtest1 multiple times.
 
-$(EXPORTED_FUNCTIONS.speedtest1): $(EXPORTED_FUNCTIONS.api.core)
+$(EXPORTED_FUNCTIONS.speedtest1): $(MKDIR.bld) $(EXPORTED_FUNCTIONS.api.core)
 	@echo "Making $@ ..."
 	@{ echo _wasm_main; cat $(EXPORTED_FUNCTIONS.api.core); } > $@
 speedtest1.js := $(dir.dout)/speedtest1.js
diff --git a/ext/wasm/fiddle.make b/ext/wasm/fiddle.make
index 5c97209122..df5c7ab7b7 100644
--- a/ext/wasm/fiddle.make
+++ b/ext/wasm/fiddle.make
@@ -7,21 +7,23 @@ MAKEFILE.fiddle := $(lastword $(MAKEFILE_LIST))
 
 ########################################################################
 # shell.c and its build flags...
-make-np-0 := make -C  $(dir.top) -n -p
-make-np-1 := sed -e 's/(TOP)/(dir.top)/g'
-# Extract SHELL_OPT and SHELL_DEP from the top-most makefile and import
-# them as vars here...
-$(eval $(shell $(make-np-0) | grep -e '^SHELL_OPT ' | $(make-np-1)))
-$(eval $(shell $(make-np-0) | grep -e '^SHELL_DEP ' | $(make-np-1)))
-# ^^^ can't do that in 1 invocation b/c newlines get stripped
-ifeq (,$(SHELL_OPT))
-$(error Could not parse SHELL_OPT from $(dir.top)/Makefile.)
-endif
-ifeq (,$(SHELL_DEP))
-$(error Could not parse SHELL_DEP from $(dir.top)/Makefile.)
-endif
+ifneq (1,$(MAKING_CLEAN))
+  make-np-0 := make -C  $(dir.top) -n -p
+  make-np-1 := sed -e 's/(TOP)/(dir.top)/g'
+  # Extract SHELL_OPT and SHELL_DEP from the top-most makefile and import
+  # them as vars here...
+  $(eval $(shell $(make-np-0) | grep -e '^SHELL_OPT ' | $(make-np-1)))
+  $(eval $(shell $(make-np-0) | grep -e '^SHELL_DEP ' | $(make-np-1)))
+  # ^^^ can't do that in 1 invocation b/c newlines get stripped
+  ifeq (,$(SHELL_OPT))
+  $(error Could not parse SHELL_OPT from $(dir.top)/Makefile.)
+  endif
+  ifeq (,$(SHELL_DEP))
+  $(error Could not parse SHELL_DEP from $(dir.top)/Makefile.)
+  endif
 $(dir.top)/shell.c: $(SHELL_DEP) $(dir.tool)/mkshellc.tcl $(sqlite3.c)
 	$(MAKE) -C $(dir.top) shell.c
+endif
 # /shell.c
 ########################################################################
 
@@ -59,49 +61,19 @@ fiddle.EXPORTED_FUNCTIONS.in := \
     $(dir.api)/EXPORTED_FUNCTIONS.sqlite3-core \
     $(dir.api)/EXPORTED_FUNCTIONS.sqlite3-extras
 
-$(EXPORTED_FUNCTIONS.fiddle): $(fiddle.EXPORTED_FUNCTIONS.in) $(MAKEFILE.fiddle)
+$(EXPORTED_FUNCTIONS.fiddle): $(MKDIR.bld) $(fiddle.EXPORTED_FUNCTIONS.in) \
+    $(MAKEFILE.fiddle)
 	sort -u $(fiddle.EXPORTED_FUNCTIONS.in) > $@
 
 fiddle.cses := $(dir.top)/shell.c $(sqlite3-wasm.c)
 
-########################################################################
-# emit rules for one of the two fiddle builds. $1 must be
-# either $(dir.fiddle) or $(dir.fiddle-debug). $2 must be empty
-# in the former case and .debug in the latter.
-define make-fiddle-rules
-fiddle-module.js$(2) := $(1)/fiddle-module.js
-fiddle-module.wasm$(2) := $$(subst .js,.wasm,$$(fiddle-module.js$(2)))
-$$(fiddle-module.js$(2)): $$(MAKEFILE) $$(MAKEFILE.fiddle) \
-    $$(EXPORTED_FUNCTIONS.fiddle) \
-    $$(fiddle.cses) $$(pre-post-fiddle-module-vanilla.deps) $$(SOAP.js)
-	@test -d "$$(dir $$@)" || mkdir -p "$$(dir $$@)"
-	$$(emcc.bin) -o $$@ $$(fiddle.emcc-flags$(2)) \
-    $$(pre-post-fiddle-module-vanilla.flags) \
-    $$(fiddle.cses)
-	$$(maybe-wasm-strip) $$(fiddle-module.wasm$(2))
-	@cp -p $$(SOAP.js) $$(dir $$@)
-	@if [[ x.debug = x$(2) ]]; then \
-		cp -p $$(dir.fiddle)/index.html \
-			$$(dir.fiddle)/fiddle.js \
-			$$(dir.fiddle)/fiddle-worker.js \
-			$$(dir $$@)/.; \
-	fi
-	@for i in $(1)/*.*js $(1)/*.html $(1)/*.wasm; do \
-		test -f $$$${i} || continue; \
-		gzip < $$$${i} > $$$${i}.gz; \
-	done
-fiddle$(2): $$(fiddle-module.js$(2)) $(1)/fiddle.js.gz
-endef
-
-$(eval $(call make-fiddle-rules,$(dir.fiddle)))
-$(eval $(call make-fiddle-rules,$(dir.fiddle-debug),.debug))
 fiddle: $(fiddle-module.js) $(fiddle-module.js.debug)
 fiddle.debug: $(fiddle-module.js.debug)
 
 clean: clean-fiddle
 clean-fiddle:
-	rm -f $(fiddle-module.js) \
-        $(fiddle-module.wasm) \
+	rm -f $(dir.fiddle)/fiddle-module.js \
+        $(dir.fiddle)/*.wasm \
         $(dir.fiddle)/sqlite3-opfs-*.js \
         $(dir.fiddle)/*.gz \
         EXPORTED_FUNCTIONS.fiddle
diff --git a/ext/wasm/mkwasmbuilds.c b/ext/wasm/mkwasmbuilds.c
index a455f3945a..29b6cafae9 100644
--- a/ext/wasm/mkwasmbuilds.c
+++ b/ext/wasm/mkwasmbuilds.c
@@ -133,6 +133,54 @@ static void mk_pre_post(const char *zName  /* build name */,
   pf("# End --pre/--post flags for %s-%s%s", zName, zMode, zBanner);
 }
 
+/*
+** Emits rules for the fiddle builds.
+**
+*/
+static void mk_fiddle(){
+  int i = 0;
+
+  mk_pre_post("fiddle-module","vanilla", 0);
+  for( ; i < 2; ++i ){
+    const char *zTail = i ? ".debug" : "";
+    const char *zDir = i ? "$(dir.fiddle-debug)" : "$(dir.fiddle)";
+
+    pf("%s# Begin fiddle%s\n", zBanner, zTail);
+    pf("fiddle-module.js%s := %s/fiddle-module.js\n", zTail, zDir);
+    pf("fiddle-module.wasm%s := "
+       "$(subst .js,.wasm,$(fiddle-module.js%s))\n", zTail, zTail);
+    pf("$(fiddle-module.js%s):%s $(MAKEFILE) $(MAKEFILE.fiddle) "
+       "$(EXPORTED_FUNCTIONS.fiddle) "
+       "$(fiddle.cses) $(pre-post-fiddle-module-vanilla.deps) "
+       "$(SOAP.js)\n",
+       zTail, (i ? " $(fiddle-module.js)" : ""));
+    if( 1==i ){/*fiddle.debug*/
+      pf("	@test -d \"$(dir $@)\" || mkdir -p \"$(dir $@)\"\n");
+    }
+    pf("	$(emcc.bin) -o $@ $(fiddle.emcc-flags%s) "
+       "$(pre-post-fiddle-module-vanilla.flags) $(fiddle.cses)\n",
+       zTail);
+    pf("	$(maybe-wasm-strip) $(fiddle-module.wasm%s)\n", zTail);
+    pf("	@cp -p $(SOAP.js) $(dir $@)\n");
+    if( 1==i ){/*fiddle.debug*/
+      pf("	cp -p $(dir.fiddle)/index.html "
+         "$(dir.fiddle)/fiddle.js "
+         "$(dir.fiddle)/fiddle-worker.js "
+         "$(dir $@)\n");
+    }
+    pf("	@for i in %s/*.*js %s/*.html %s/*.wasm; do \\\n"
+       "		test -f $${i} || continue;             \\\n"
+       "		gzip < $${i} > $${i}.gz; \\\n"
+       "	done\n", zDir, zDir, zDir);
+    if( 0==i ){
+      ps("fiddle: $(fiddle-module.js)");
+    }else{
+      ps("fiddle-debug: $(fiddle-module-debug.js)");
+    }
+    pf("# End fiddle%s%s", zTail, zBanner);
+  }
+}
+
 /*
 ** Emits makefile code for one build of the library, primarily defined
 ** by the combination of zName and zMode, each of which must be values
@@ -229,7 +277,7 @@ int main(void){
               "$(c-pp.D.sqlite3-bundler-friendly) -Dwasmfs",
               "-sEXPORT_ES6 -sUSE_ES6_IMPORT_META");
 
-  mk_pre_post("fiddle-module","vanilla", 0);
+  mk_fiddle();
   mk_pre_post("speedtest1","vanilla", 0);
   mk_pre_post("speedtest1-wasmfs","esm", "$(c-pp.D.sqlite3-bundler-friendly) -Dwasmfs");
   return rc;
diff --git a/ext/wasm/wasmfs.make b/ext/wasm/wasmfs.make
index 4d34c42140..9de5574f26 100644
--- a/ext/wasm/wasmfs.make
+++ b/ext/wasm/wasmfs.make
@@ -7,7 +7,7 @@
 ########################################################################
 MAKEFILE.wasmfs := $(lastword $(MAKEFILE_LIST))
 # ensure that the following message starts on line 10 or higher for proper
-# alignment!
+# $(warning) alignment!
 ifneq (1,$(MAKING_CLEAN))
   $(warning !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!)
   $(warning !! The WASMFS build is not well-supported. WASMFS is a proverbial)
diff --git a/manifest b/manifest
index b9eed692c0..45d994c0f6 100644
--- a/manifest
+++ b/manifest
@@ -1,9 +1,9 @@
-C Get\smore\sof\sthe\sCLI\sutils\sbuilding.
-D 2024-10-01T13:40:59.914
+C Merge\strunk\sinto\sautosetup\sbranch.
+D 2024-10-05T12:06:31.859
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
-F Makefile.in 19afd3c31ea260e22eea118053b97d79f2b8d40b5d388e2c9c8a573554b97d4d
+F Makefile.in fc3b3656ee35ba81f492a5db71f3eef8f3fd789f04416cfa1fd51533933c5d9a
 F Makefile.linux-gcc f3842a0b1efbfbb74ac0ef60e56b301836d05b4d867d014f714fa750048f1ab6
 F Makefile.msc 9c6d80d9d103fa42e931f4c464884a5e577fae8563acc7589bff4e43fbe8f864
 F README.md c3c0f19532ce28f6297a71870f3c7b424729f0e6d9ab889616d3587dd2332159
@@ -112,15 +112,15 @@ F ext/fts3/unicode/mkunicode.tcl 63db9624ccf70d4887836c320eda93ab552f21008f3be7e
 F ext/fts3/unicode/parseunicode.tcl a981bd6466d12dd17967515801c3ff23f74a281be1a03cf1e6f52a6959fc77eb
 F ext/fts5/extract_api_docs.tcl 009cf59c77afa86d137b0cca3e3b1a5efbe2264faa2df233f9a7aa8563926d15
 F ext/fts5/fts5.h efaaac0df3d3bc740383044c144b582f47921aafa21d7b10eb98f42c24c740b0
-F ext/fts5/fts5Int.h 93aba03ca417f403b07b2ab6f50aa0e0c1b8b031917a9026b81520e7047a168e
+F ext/fts5/fts5Int.h bf0d3efa144f36e00f9b5206626aec2f436f58186a0835092394f2202e9828e3
 F ext/fts5/fts5_aux.c 65a0468dd177d6093aa9ae1622e6d86b0136b8d267c62c0ad6493ad1e9a3d759
 F ext/fts5/fts5_buffer.c 0eec58bff585f1a44ea9147eae5da2447292080ea435957f7488c70673cb6f09
-F ext/fts5/fts5_config.c da21548ddbc1a457cb42545f527065221ede8ada6a734891b8c34317a7a9506b
+F ext/fts5/fts5_config.c a6633d88596758941c625b526075b85d3d9fd1089d8d9eab5db6e8a71fd347ad
 F ext/fts5/fts5_expr.c 9a56f53700d1860f0ee2f373c2b9074eaf2a7aa0637d0e27a6476de26a3fee33
 F ext/fts5/fts5_hash.c adda4272be401566a6e0ba1acbe70ee5cb97fce944bc2e04dc707152a0ec91b1
-F ext/fts5/fts5_index.c 571483823193f09439356741669aa8c81da838ae6f5e1bfa7517f7ee2fb3addd
-F ext/fts5/fts5_main.c 4503498d3453e29a3cd89dacaba029011e89cb8c481a6241611d106e7a369bd4
-F ext/fts5/fts5_storage.c 3332497823c3d171cf56379f2bd8c971ce15a19aadacff961106462022c92470
+F ext/fts5/fts5_index.c 368a968570ce12ba40223e284a588d9f93ee23a0133727f0df1fcd64086b1fb6
+F ext/fts5/fts5_main.c 50eb059e51d730e8e0c77df4e568b018079e112a755c094488b0d5b1aa06afbb
+F ext/fts5/fts5_storage.c 337b05e4c66fc822d031e264d65bde807ec2fab08665ca2cc8aaf9c5fa06792c
 F ext/fts5/fts5_tcl.c 4db9258a7882c5eac0da4433042132aaf15b87dd1e1636c7a6ca203abd2c8bfe
 F ext/fts5/fts5_test_mi.c 08c11ec968148d4cb4119d96d819f8c1f329812c568bac3684f5464be177d3ee
 F ext/fts5/fts5_test_tok.c 3cb0a9b508b30d17ef025ccddd26ae3dc8ddffbe76c057616e59a9aa85d36f3b
@@ -164,7 +164,7 @@ F ext/fts5/test/fts5contentless.test 606f063b29ba0f46d4b79aa36cdd1ef4dab5de53eae
 F ext/fts5/test/fts5contentless2.test 70ffe6c611d8f278240da56734df8a77948f04e2739b358439e9bdcf56ced35f
 F ext/fts5/test/fts5contentless3.test 75eaae5ad6b284ee447788943974d323228f27cc35a1681da997135cff95bc6a
 F ext/fts5/test/fts5contentless4.test ec34dc69ef474ca9997dae6d91e072906e0e9a5a4b05ea89964c863833b6eff8
-F ext/fts5/test/fts5contentless5.test 40cdcb4fe751672450829c5a96bd32c25fc2f6076279dd2ce5c58ac9a390132a
+F ext/fts5/test/fts5contentless5.test 38cd0392c730dc7090c550321ce3c24ba4c392bc97308b51a4180e9959dca7b5
 F ext/fts5/test/fts5corrupt.test 6485f721b88ba355ca5d701e7ee87a4efa3ea578d8e6adb26f51ef956c8328bd
 F ext/fts5/test/fts5corrupt2.test 335911e3f68b9625d850325f9e29a128db3f4276a8c9d4e32134580da8f924c4
 F ext/fts5/test/fts5corrupt3.test 4fc3bf129f1616bea00884a23fd9d7b0e46d01791d2b57fe8d68ac36e8d3ff7c
@@ -173,7 +173,7 @@ F ext/fts5/test/fts5corrupt5.test 11b47126f5772cc37b67e3e8b2ed05895c4d07c05338bc
 F ext/fts5/test/fts5corrupt6.test 2d72db743db7b5d9c9a6d0cfef24d799ed1aa5e8192b66c40e871a37ed9eed06
 F ext/fts5/test/fts5corrupt7.test 4e830875c33b9ea3c4cf1ba71e692b63893cbb4faae8c69b1071889dc26e211c
 F ext/fts5/test/fts5corrupt8.test b81d802e41631e98100f49a1aadeeffef860e30a62d6ed7d743c2797c477239e
-F ext/fts5/test/fts5delete.test 619295b20dbc1d840b403ee07c878f52378849c3c02e44f2ee143b3e978a0aa7
+F ext/fts5/test/fts5delete.test 2a5008f8b1174ef41d1974e606928c20e4f9da77d9f8347aed818994d89cced4
 F ext/fts5/test/fts5detail.test 54015e9c43ec4ba542cfb93268abdf280e0300f350efd08ee411284b03595cc4
 F ext/fts5/test/fts5determin.test 1b77879b2ae818b5b71c859e534ee334dac088b7cf3ff3bf76a2c82b1c788d11
 F ext/fts5/test/fts5dlidx.test a7c42b0a74dc7c8aa1a46d586e0aadda4b6cc42c24450f8d3774b21166e93159
@@ -265,7 +265,9 @@ F ext/fts5/test/fts5unicode2.test 3bbd30152f9f760bf13886e5b1e5ec23ff62f56758ddda
 F ext/fts5/test/fts5unicode3.test f4891a3dac3b49c3d7c0fdb29566e9eb0ecff35263370c89f9661b1952b20818
 F ext/fts5/test/fts5unicode4.test 728c8f0caafb05567f524ad313d9f8b780fa45987b8a8df04eff87923c74b4d0
 F ext/fts5/test/fts5unindexed.test 168838d2c385e131120bbf5b516d2432a5fabc4caa2259c932e1d49ae209a4ae
+F ext/fts5/test/fts5unindexed2.test 516236eceaac05ace322290a0d3705b4c4ffe4760d8eb9d014d9d27d56dfcc02
 F ext/fts5/test/fts5update.test b8affd796e45c94a4d19ad5c26606ea06065a0f162a9562d9f005b5a80ccf0bc
+F ext/fts5/test/fts5update2.test c5baa76799ac605ebb8e5e21035db2014b396cef25c903eb96ba39b1d6f9f046
 F ext/fts5/test/fts5version.test c22d163c17e60a99f022cbc52de5a48bb7f84deaa00fe15e9bc4c3aa1996204e
 F ext/fts5/test/fts5vocab.test 2a2bdb60d0998fa3124d541b6d30b019504918dc43a6584645b63a24be72f992
 F ext/fts5/test/fts5vocab2.test bbba149c254375d00055930c1a501c9a51e80b0d20bf7b98f3e9fa3b03786373
@@ -622,7 +624,7 @@ F ext/userauth/sqlite3userauth.h 7f3ea8c4686db8e40b0a0e7a8e0b00fac13aa7a3
 F ext/userauth/user-auth.txt ca7e9ee82ca4e1c1744295f8184dd70edfae1992865d26c64303f539eb6c084c
 F ext/userauth/userauth.c 7f00cded7dcaa5d47f54539b290a43d2e59f4b1eb5f447545fa865f002fc80cb
 F ext/wasm/EXPORTED_FUNCTIONS.fiddle.in 27450c8b8c70875a260aca55435ec927068b34cef801a96205adb81bdcefc65c
-F ext/wasm/GNUmakefile 34a4590ae3f7ce5a70bf1c6f0384a7935e6c9809281e40165381ba04df34ceae
+F ext/wasm/GNUmakefile bfd63f0462ac7e5b814a267e9101b8284d61731574ec673dae3178643cdb89ef
 F ext/wasm/README-dist.txt 6382cb9548076fca472fb3330bbdba3a55c1ea0b180ff9253f084f07ff383576
 F ext/wasm/README.md a8a2962c3aebdf8d2104a9102e336c5554e78fc6072746e5daf9c61514e7d193
 F ext/wasm/SQLTester/GNUmakefile e0794f676d55819951bbfae45cc5e8d7818dc460492dc317ce7f0d2eca15caff
@@ -674,7 +676,7 @@ F ext/wasm/demo-worker1.html 2c178c1890a2beb5a5fecb1453e796d067a4b8d3d2a04d65ca2
 F ext/wasm/demo-worker1.js 836bece8615b17b1b572584f7b15912236a5947fe8c68b98d2737d7e287447ef
 F ext/wasm/dist.make 653e212c1e84aa3be168d62a10616ccea45ee9585b0192745d2706707a5248ce
 F ext/wasm/example_extra_init.c 2347cd69d19d839ef4e5e77b7855103a7fe3ef2af86f2e8c95839afd8b05862f
-F ext/wasm/fiddle.make 8ccee74606582336ba885df75fbd6b40c0bb0d0a686f6472d4b6dacec1393145
+F ext/wasm/fiddle.make ec2353f0eddade864f67b993376a0949e27b72465c24b1970940e48b70bc2df1
 F ext/wasm/fiddle/fiddle-worker.js 850e66fce39b89d59e161d1abac43a181a4caa89ddeea162765d660277cd84ce
 F ext/wasm/fiddle/fiddle.js b444a5646a9aac9f3fc06c53d78af5e1912eb235d69a8e6010723e4eb0e9d4a1
 F ext/wasm/fiddle/index.html c79b1741cbeba78f88af0a84cf5ec7de87a909a6a8d10a369b1f4824c66c2088
@@ -682,7 +684,7 @@ F ext/wasm/index-dist.html 564b5ec5669676482c5a25dea9e721d8eafed426ecb155f93d29a
 F ext/wasm/index.html e4bbffdb3d40eff12b3f9c7abedef91787e2935620b7f8d40f2c774b80ad8fa9
 F ext/wasm/jaccwabyt/jaccwabyt.js 1264710db3cfbcb6887d95665b7aeba60c1126eaef789ca4cf1a4a17d5bc7f54
 F ext/wasm/jaccwabyt/jaccwabyt.md 59a20df389abcc3606eb4eaea7fb7ba14504beb3e345dbea9b99a0618ba3bec8
-F ext/wasm/mkwasmbuilds.c e58bad0558f6b8359e6ebb9262a0bf30dfd1db9715ec8a0de9f1e74433944b57
+F ext/wasm/mkwasmbuilds.c e3580b26bc393e4e4beb25f6349b999878782f3319b740469f64c2e772632e03
 F ext/wasm/module-symbols.html dc476b403369b26a1a23773e13b80f41b9a49f0825e81435fe3600a7cfbbe337
 F ext/wasm/scratchpad-wasmfs.html a3d7388f3c4b263676b58b526846e9d02dfcb4014ff29d3a5040935286af5b96
 F ext/wasm/scratchpad-wasmfs.mjs 66034b9256b218de59248aad796760a1584c1dd842231505895eff00dbd57c63
@@ -702,7 +704,7 @@ F ext/wasm/tester1.c-pp.js bb8c41a56ca0eabb945ca2e8f06324a7b63ad91630959d714b071
 F ext/wasm/tests/opfs/concurrency/index.html 657578a6e9ce1e9b8be951549ed93a6a471f4520a99e5b545928668f4285fb5e
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 F ext/wasm/tests/opfs/concurrency/worker.js 0a8c1a3e6ebb38aabbee24f122693f1fb29d599948915c76906681bb7da1d3d2
-F ext/wasm/wasmfs.make 8067daf346482cdb91414c3f6b8f6ff110bfa874294f73e13479c755af67ec20
+F ext/wasm/wasmfs.make bc8bb227f35d5bd3863a7bd2233437c37472a0d81585979f058f9b9b503bef35
 F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895 x
 F ltmain.sh 3ff0879076df340d2e23ae905484d8c15d5fdea8
 F magic.txt 5ade0bc977aa135e79e3faaea894d5671b26107cc91e70783aa7dc83f22f3ba0
@@ -733,14 +735,14 @@ F src/callback.c db3a45e376deff6a16c0058163fe0ae2b73a2945f3f408ca32cf74960b28d49
 F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
 F src/ctime.c b224d3db0f28c4a5f1407c50107a0a8133bd244ff3c7f6f8cedeb896a8cf1b64
 F src/date.c 89ce1ff20512a7fa5070ba6e7dd5c171148ca7d580955795bf97c79c2456144a
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 F src/dbstat.c 73362c0df0f40ad5523a6f5501224959d0976757b511299bf892313e79d14f5c
 F src/delete.c 03a77ba20e54f0f42ebd8eddf15411ed6bdb06a2c472ac4b6b336521bf7cea42
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 F src/fkey.c 928ed2517e8732113d2b9821aa37af639688d752f4ea9ac6e0e393d713eeb76f
 F src/func.c df400a1d3f4625997d4dd8a81951c303e066277c29b861d37e03cd152d7858dd
-F src/global.c 61a419dd9e993b9be0f91de4c4ccf322b053eb829868e089f0321dd669be3b90
+F src/global.c a19e4b1ca1335f560e9560e590fc13081e21f670643367f99cb9e8f9dc7d615b
 F src/hash.c 9ee4269fb1d6632a6fecfb9479c93a1f29271bddbbaf215dd60420bcb80c7220
 F src/hash.h 3340ab6e1d13e725571d7cee6d3e3135f0779a7d8e76a9ce0a85971fa3953c51
 F src/hwtime.h f9c2dfb84dce7acf95ce6d289e46f5f9d3d1afd328e53da8f8e9008e3b3caae6
@@ -749,7 +751,7 @@ F src/insert.c f8d1a0f8ee258411009c6b7f2d93170e351bd19f5ad89d57e1180644297cbe70
 F src/json.c 68a98c020c22127f2d65f08855f7fc7460ff352a6ce0b543d8931dde83319c22
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 7432c944ff197046d67a1207790a1b13eec4548c85a9457eb0896bb3641dfb36
-F src/main.c 4db6e3bde55ba0b24ccc83600c2b6ea11429f61ce7b3a2e7e3b42e1b45366c3e
+F src/main.c d55d27db5a3b7bb12e1b723e350efd833586f22baa4b15ca2c0b4bde9a44ae29
 F src/malloc.c 410e570b30c26cc36e3372577df50f7a96ee3eed5b2b161c6b6b48773c650c5e
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
 F src/mem1.c 3bb59158c38e05f6270e761a9f435bf19827a264c13d1631c58b84bdc96d73b2
@@ -787,17 +789,17 @@ F src/random.c 606b00941a1d7dd09c381d3279a058d771f406c5213c9932bbd93d5587be4b9c
 F src/resolve.c 9750a281f7ba073b4e6da2be1a6c4071f5d841a7746c5fb3f70d6d793b6675ea
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 F src/select.c 4b14337a2742f0c0beeba490e9a05507e9b4b12184b9cd12773501d08d48e3fe
-F src/shell.c.in 857c60ed21ae2c58d7740d790e8b22e167136ad1930af50527ec0e584a8cc8aa
-F src/sqlite.h.in b20547021d20ba016c2fd0500f14f08a21ff23e64a0ed93e72ca0fecb9e1d0a0
+F src/shell.c.in 981efe98f98a983c1d0193d18528eb2d765207c0c82b67b610be60f17995a43e
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 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 3f046c04ea3595d6bfda99b781926b17e672fd6d27da2ba6d8d8fc39981dcb54
-F src/sqliteInt.h 5978cbb11becc3ce6471015d770d95f694ece06336c496f691df1b02460e9cd5
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 F src/sqliteLimit.h 6878ab64bdeb8c24a1d762d45635e34b96da21132179023338c93f820eee6728
 F src/status.c cb11f8589a6912af2da3bb1ec509a94dd8ef27df4d4c1a97e0bcf2309ece972b
 F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
 F src/tclsqlite.c c6888598f08dee3d9112a38ef42c8f5c89ca7f3190f4694744d0b84250f4bf8c
 F src/tclsqlite.h c6af51f31a2b2172d674608763a4b98fdf5cd587e4025053e546fb8077757262
-F src/test1.c 8d7cd219c004cd2ced60659ebf045025cc5c16ce19d12459589dacd4310f7f07
+F src/test1.c 8bf8b74145b768f42386787f93f6d6dad7bc400a4ee2d50e4ad5a06a20a97ef1
 F src/test2.c 7ebc518e6735939d8979273a6f7b1d9b5702babf059f6ad62499f7f60a9eb9a3
 F src/test3.c e7573aa0f78ee4e070a4bc8c3493941c1aa64d5c66d4825c74c0f055451f432b
 F src/test4.c 13e57ae7ec7a959ee180970aef09deed141252fe9bb07c61054f0dfa4f1dfd5d
@@ -811,7 +813,7 @@ F src/test_backup.c bd901e3c116c7f3b3bbbd4aae4ce87d99b400c9cbb0a9e7b4610af451d97
 F src/test_bestindex.c 3401bee51665cbf7f9ed2552b5795452a8b86365e4c9ece745b54155a55670c6
 F src/test_blob.c bcdf6a6c22d0bcc13c41479d63692ef413add2a4d30e1e26b9f74ab85b9fb4d5
 F src/test_btree.c 28283787d32b8fa953eb77412ad0de2c9895260e4e5bd5a94b3c7411664f90d5
-F src/test_config.c 345b8e383f71cecc36d0fa05f2f06639c254b188f98101c3c97749df43037086
+F src/test_config.c e8d041a84151cbaee4dd82eb32e4153abe06856bcfab4771968a8cf930a86332
 F src/test_delete.c e2fe07646dff6300b48d49b2fee2fe192ed389e834dd635e3b3bac0ce0bf9f8f
 F src/test_demovfs.c 3efa2adf4f21e10d95521721687d5ca047aea91fa62dd8cc22ac9e5a9c942383
 F src/test_devsym.c 649434ed34d0b03fbd5a6b42df80f0f9a7e53f94dd1710aad5dd8831e91c4e86
@@ -854,13 +856,13 @@ F src/trigger.c 0bb986a5b96047fd597c6aac28588853df56064e576e6b81ba777ef2ccaac461
 F src/update.c 0e01aa6a3edf9ec112b33eb714b9016a81241497b1fb7c3e74332f4f71756508
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 F src/vacuum.c b763b6457bd058d2072ef9364832351fd8d11e8abf70cbb349657360f7d55c40
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 F src/vdbeapi.c 53c7e26a2c0821a892b20eee2cde4656e31998212f3d515576c780dfaa45fd17
-F src/vdbeaux.c 676dbee99b4febdd94bc9658667a2e3bc413c4c0e356242d90f98a1155d513e5
+F src/vdbeaux.c f06f011e4fac948941ea821ac365a9f1c163ef473e63756d6e499a37c6bda9ef
 F src/vdbeblob.c 255be187436da38b01f276c02e6a08103489bbe2a7c6c21537b7aecbe0e1f797
 F src/vdbemem.c df568ef0187e4be2788c35174f6d9b8566ab9475f9aff2d73907ed05aa5684b2
 F src/vdbesort.c d0a3c7056c081703c8b6d91ad60f17da5e062a5c64bf568ed0fa1b5f4cae311f
@@ -868,7 +870,7 @@ F src/vdbetrace.c fe0bc29ebd4e02c8bc5c1945f1d2e6be5927ec12c06d89b03ef2a4def34bf8
 F src/vdbevtab.c fc46b9cbd759dc013f0b3724549cc0d71379183c667df3a5988f7e2f1bd485f3
 F src/vtab.c 316cd48e9320660db3047cd306cd056e4361180cebb4d0f10a39244e10c11422
 F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
-F src/wal.c ef68130ba330ee18c1cb22da36a881c82e3a3b109badbdc6a9b9acaf788a6688
+F src/wal.c a0d42bfdef935e1389737152394d08e59e7c48697f40a9fc2e0552cb19dc731f
 F src/wal.h ba252daaa94f889f4b2c17c027e823d9be47ce39da1d3799886bbd51f0490452
 F src/walker.c d5006d6b005e4ea7302ad390957a8d41ed83faa177e412f89bc5600a7462a014
 F src/where.c 461d41017d900d4248a268df96d2d30506c4dcc2257f4167c4f46072003ce2cf
@@ -925,7 +927,7 @@ F test/async2.test c0a9bd20816d7d6a2ceca7b8c03d3d69c28ffb8b
 F test/async3.test d73a062002376d7edc1fe3edff493edbec1fc2f7
 F test/async4.test 1787e3952128aa10238bf39945126de7ca23685a
 F test/async5.test 383ab533fdb9f7ad228cc99ee66e1acb34cc0dc0
-F test/atof1.test f2765d7fdc1348ae58b279d096d301a208e46da623213877b2ba580dc2768975
+F test/atof1.test 7ec56debc04b32e8f9dc87239f4bbb07d84550fb83dd7475b0ead9e83beb35da
 F test/atomic.test 065a453dde33c77ff586d91ccaa6ed419829d492dbb1a5694b8a09f3f9d7d061
 F test/atomic2.test b6863b4aa552543874f80b42fb3063f1c8c2e3d8e56b6562f00a3cc347b5c1da
 F test/atrc.c c388fac43dbba05c804432a7135ae688b32e8f25818e9994ffba4b64cf60c27c
@@ -1008,7 +1010,7 @@ F test/capi3c.test 31d3a6778f2d06f2d9222bd7660c41a516d1518a059b069e96ebbeadb5a49
 F test/capi3d.test 8b778794af891b0dca3d900bd345fbc8ebd2aa2aae425a9dccdd10d5233dfbde
 F test/capi3e.test 3d49c01ef2a1a55f41d73cba2b23b5059ec460fe
 F test/carray01.test 23ed7074307c4a829ba5ff2970993a9d87db7c5cdbbe1a2cbef672d0df6d6e31
-F test/cast.test 42f7d79d88ab5e8080e96c650c52fcf72eef3e6476aaaee2c9f6e074396cfdfc
+F test/cast.test 6d095303492432a973e6dfc0071cb94cac2969ffbe2e6a68432be0c7b3b0a2d3
 F test/cffault.test 9d6b20606afe712374952eec4f8fd74b1a8097ef
 F test/changes.test 4377d202a487f66fc2822c1bf57c46798c8b2caf7446f4f701723b1dbb6b86f6
 F test/changes2.test 07949edcc732af28cb54276bfb7d99723bccc1e905a423648bf57ac5cb0dc792
@@ -1172,7 +1174,7 @@ F test/fkey8.test 51deda7f1a1448bca95875e4a6e1a3a75b4bd7215e924e845bd60de60e4d84
 F test/fkey_malloc.test 594a7ea1fbab553c036c70813cd8bd9407d63749
 F test/fordelete.test ba98f14446b310f9c9d935b97ec748753d0144a28b356ba30d1f4f6958fdde5c
 F test/format4.test eeae341953db8b6bda7f549044797c3278a6cc345d11ada81471671b654f8ef4
-F test/fp-speed-1.c ca95152d579530c967240ead1387dc1208052d310dfa22bc9ebded56d4e6c026
+F test/fp-speed-1.c b37de94eba034e1703668816225f54510ec60fb0685406608cc707afe6b8234d
 F test/fpconv1.test d5d8aa0c427533006c112fb1957cdd1ea68c1d0709470dabb9ca02c2e4c06ad8
 F test/fts-9fd058691.test 78b887e30ae6816df0e1fed6259de4b5a64ad33c
 F test/fts3.test 672a040ea57036fb4b6fdc09027c18d7d24ab654
@@ -1270,10 +1272,10 @@ F test/fts4umlaut.test fcaca4471de7e78c9d1f7e8976e3e8704d7d8ad979d57a739d00f3f75
 F test/fts4unicode.test 82a9c16b68ba2f358a856226bb2ee02f81583797bc4744061c54401bf1a0f4c9
 F test/fts4upfrom.test f25835162c989dffd5e2ef91ec24c4848cc9973093e2d492d1c7b32afac1b49d
 F test/full.test 6b3c8fb43c6beab6b95438c1675374b95fab245d
-F test/func.test b56905748ce0567c01d60005f3e6ad1af19453d224ba4730ee687d048fd09ef9
+F test/func.test 098d28ecd1284e0625797a981c9dbf7c1664763af2900f96b9716af80e6cbe40
 F test/func2.test 69f6ae3751b4ec765bdc3b803c0a255aa0f693f28f44805bef03e6b4a3fd242f
 F test/func3.test 600a632c305a88f3946d38f9a51efe145c989b2e13bd2b2a488db47fe76bab6a
-F test/func4.test a3f9062487dbd826776f54f4e0e9517fe8c3cf689af92735308965774d51fac5
+F test/func4.test a02e695f62beb31cb092dccf6873ff97543407fff97a5f3ec4da70b5b337bc84
 F test/func5.test 863e6d1bd0013d09c17236f8a13ea34008dd857d87d85a13a673960e4c25d82a
 F test/func6.test 3bc89ec0f2605736d3a118f43d25ef58115a7db4dba8ae939a363917d815c0bb
 F test/func7.test 7e009275f52c52954c8c028fdb62f8bc16cc47276fcc8753c1d2b22c6e074598
@@ -1666,7 +1668,7 @@ F test/skipscan5.test 0672103fd2c8f96bd114133f356192b35ece45c794fe3677e1d9e5e310
 F test/skipscan6.test bddbb35dd335e2d21b7791a61e3b2e1f3255dc307ce80aa6fe19cc298e6feb13
 F test/snapshot.test a504f2e7009f512ef66c719f0ea1c55a556bdaf1e1312c80a04d46fc1a3e9632
 F test/snapshot2.test 8d6ff5dd9cc503f6e12d408a30409c3f9c653507b24408d9cd7195931c89bc54
-F test/snapshot3.test 8744313270c55f6e18574283553d3c5c5fe4c5970585663613a0e75c151e599b
+F test/snapshot3.test 41350216abc6c7da37113ad462259c070786e5ad70bdc8709daaed148b1b3a2c
 F test/snapshot4.test d4e9347ef2fcabc491fc893506c7bbaf334da3be111d6eb4f3a97cc623b78322
 F test/snapshot_fault.test 129234ceb9b26a0e1000e8563a16e790f5c1412354e70749cbd78c3d5d07d60a
 F test/snapshot_up.test 77dc7853bfb2b4fa249f76e1714cfa1e596826165d9ef22c06ac3a0b7b778d9a
@@ -1687,7 +1689,7 @@ F test/speed3.test 694affeb9100526007436334cf7d08f3d74b85ef
 F test/speed4.test abc0ad3399dcf9703abed2fff8705e4f8e416715
 F test/speed4p.explain 6b5f104ebeb34a038b2f714150f51d01143e59aa
 F test/speed4p.test 377a0c48e5a92e0b11c1c5ebb1bc9d83a7312c922bc0cb05970ef5d6a96d1f0c
-F test/speedtest1.c 19c9b60908d25502d2831f97efee8b81006c356ab8c08327e25d24a4144f2131
+F test/speedtest1.c cc503febbb8559d541a67d7a33d3d7bb8a2c8cbbfc89eb336e2e2bd6ad6a63ee
 F test/spellfix.test 951a6405d49d1a23d6b78027d3877b4a33eeb8221dcab5704b499755bb4f552e
 F test/spellfix2.test dfc8f519a3fc204cb2dfa8b4f29821ae90f6f8c3
 F test/spellfix3.test 0f9efaaa502a0e0a09848028518a6fb096c8ad33
@@ -1735,7 +1737,7 @@ F test/temptable3.test d11a0974e52b347e45ee54ef1923c91ed91e4637
 F test/temptrigger.test 38f0ca479b1822d3117069e014daabcaacefffcc
 F test/tester.tcl 7b44f1a9b9a2de8112695b908afc21dd9a68cd2d44e84b73f1b27b53492c0d59
 F test/testrunner.tcl 3dd75b45593d2afa2e3bca76121297a9f163bebb98474b13536f326829a71db1 x
-F test/testrunner_data.tcl dbc0bb1c5b912dfd1e32b25d544318e412edd6085bd5fc9e6619cb93a739b786
+F test/testrunner_data.tcl c7b3b911e44f7e8c01cc6bc7571e16115cdc2e4db46630bd2acd7a931a46380e
 F test/thread001.test a0985c117eab62c0c65526e9fa5d1360dd1cac5b03bde223902763274ce21899
 F test/thread002.test c24c83408e35ba5a952a3638b7ac03ccdf1ce4409289c54a050ac4c5f1de7502
 F test/thread003.test ee4c9efc3b86a6a2767516a37bd64251272560a7
@@ -2185,7 +2187,7 @@ F tool/showstat4.c 0682ebea7abf4d3657f53c4a243f2e7eab48eab344ed36a94bb75dcd19a5c
 F tool/showwal.c 11eca547980a066b081f512636151233350ac679f29ecf4ebfce7f4530230b3d
 F tool/soak1.tcl 8d407956e1a45b485a8e072470a3e629a27037fe
 F tool/spaceanal.tcl 1f83962090a6b60e1d7bf92495d643e622bef9fe82ea3f2d22350dcbce9a12d0
-F tool/speed-check.sh e8d20cc2eb9c85ec1ba562226de144435456dcdff4ee618de49603c6958f6116
+F tool/speed-check.sh e566ab3934d7d78631743a984ad3f67c331c911bb18ff5d0a6c616a2afee7f91
 F tool/speedtest.tcl 06c76698485ccf597b9e7dbb1ac70706eb873355
 F tool/speedtest16.c ecb6542862151c3e6509bbc00509b234562ae81e
 F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
@@ -2194,7 +2196,7 @@ F tool/speedtest8inst1.c 7ce07da76b5e745783e703a834417d725b7d45fd
 F tool/spellsift.tcl 52b4b04dc4333c7ab024f09d9d66ed6b6f7c6eb00b38497a09f338fa55d40618 x
 F tool/split-sqlite3c.tcl 5aa60643afca558bc732b1444ae81a522326f91e1dc5665b369c54f09e20de60
 F tool/sqldiff.c 2a0987d183027c795ced13d6749061c1d2f38e24eddb428f56fa64c3a8f51e4b
-F tool/sqlite3-rsync.c 187b262035c1159b047dbfa1959c168b87b5a153b63465e8c8bd1b54fabf4460
+F tool/sqlite3-rsync.c 2f06f02ee3a28f847b3fb8c0f32e3b3296571e0f8027939b95d32df5edfe1dd9
 F tool/sqlite3_analyzer.c.in 348ba349bbdc93c9866439f9f935d7284866a2a4e6898bc906ae1204ade56918
 F tool/sqltclsh.c.in 1bcc2e9da58fadf17b0bf6a50e68c1159e602ce057210b655d50bad5aaaef898
 F tool/sqltclsh.tcl 862f4cf1418df5e1315b5db3b5ebe88969e2a784525af5fbf9596592f14ed848
@@ -2233,8 +2235,8 @@ F vsixtest/vsixtest.tcl 6195aba1f12a5e10efc2b8c0009532167be5e301abe5b31385638080
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 98bbba3a05734e080a0c8c51fac0368436809d4ff3c39959a51970400b4470cb
-R d61b1bae6c19264b9c460b550873251d
+P 6838b7b5d6130b1e0af9a71ad2c5922b1ef35f082907dffeed03811e1e62406f 2f7eab381e16760952d1c90a9119d2a217933f0136442d8f6eeb6d95e366ca4f
+R 718af76a1b8b829ff662e805c69f5727
 U stephan
-Z 5f773d8b1897a9c16436ea21d9b0af59
+Z d5ebe1dc79c6b40a021966341f66c463
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index d1a0280e23..13b38ba824 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-6838b7b5d6130b1e0af9a71ad2c5922b1ef35f082907dffeed03811e1e62406f
+6cbb05fde1b74ced6d56d6ec7f815c989697381531175daccebc4311bfef61d9
diff --git a/src/dbpage.c b/src/dbpage.c
index 42b24f9b8d..a0ee9246dc 100644
--- a/src/dbpage.c
+++ b/src/dbpage.c
@@ -57,8 +57,8 @@ struct DbpageCursor {
 struct DbpageTable {
   sqlite3_vtab base;              /* Base class.  Must be first */
   sqlite3 *db;                    /* The database */
-  int nTrunc;                     /* Entries in aTrunc[] */
-  Pgno *aTrunc;                   /* Truncation size for each database */
+  int iDbTrunc;                   /* Database to truncate */
+  Pgno pgnoTrunc;                 /* Size to truncate to */
 };
 
 /* Columns */
@@ -107,8 +107,6 @@ static int dbpageConnect(
 ** Disconnect from or destroy a dbpagevfs virtual table.
 */
 static int dbpageDisconnect(sqlite3_vtab *pVtab){
-  DbpageTable *pTab = (DbpageTable *)pVtab;
-  sqlite3_free(pTab->aTrunc);
   sqlite3_free(pVtab);
   return SQLITE_OK;
 }
@@ -375,19 +373,12 @@ static int dbpageUpdate(
   if( sqlite3_value_type(argv[3])!=SQLITE_BLOB 
    || sqlite3_value_bytes(argv[3])!=szPage
   ){
-    if( sqlite3_value_type(argv[3])==SQLITE_NULL && isInsert ){
-      if( iDb>=pTab->nTrunc ){
-        testcase( pTab->aTrunc!=0 );
-        pTab->aTrunc = sqlite3_realloc(pTab->aTrunc, (iDb+1)*sizeof(Pgno));
-        if( pTab->aTrunc ){
-          int j;
-          for(j=pTab->nTrunc; j<iDb; j++) pTab->aTrunc[j] = 0;
-          pTab->nTrunc = iDb+1;
-        }else{
-          return SQLITE_NOMEM;
-        }
-      }
-      pTab->aTrunc[iDb] = pgno;
+    if( sqlite3_value_type(argv[3])==SQLITE_NULL && isInsert && pgno>1 ){
+      /* "INSERT INTO dbpage($PGNO,NULL)" causes page number $PGNO and
+      ** all subsequent pages to be deleted. */
+      pTab->iDbTrunc = iDb;
+      pgno--;
+      pTab->pgnoTrunc = pgno;
     }else{
       zErr = "bad page value";
       goto update_fail;
@@ -400,6 +391,7 @@ static int dbpageUpdate(
     if( (rc = sqlite3PagerWrite(pDbPage))==SQLITE_OK && pData ){
       unsigned char *aPage = sqlite3PagerGetData(pDbPage);
       memcpy(aPage, pData, szPage);
+      pTab->pgnoTrunc = 0;
     }
   }
   sqlite3PagerUnref(pDbPage);
@@ -423,29 +415,31 @@ static int dbpageBegin(sqlite3_vtab *pVtab){
     Btree *pBt = db->aDb[i].pBt;
     if( pBt ) (void)sqlite3BtreeBeginTrans(pBt, 1, 0);
   }
-  if( pTab->nTrunc>0 ){
-    memset(pTab->aTrunc, 0, sizeof(pTab->aTrunc[0])*pTab->nTrunc);
-  }
+  pTab->pgnoTrunc = 0;
   return SQLITE_OK;
 }
 
 /* Invoke sqlite3PagerTruncate() as necessary, just prior to COMMIT
 */
 static int dbpageSync(sqlite3_vtab *pVtab){
-  int iDb;
   DbpageTable *pTab = (DbpageTable *)pVtab;
-
-  for(iDb=0; iDb<pTab->nTrunc; iDb++){
-    if( pTab->aTrunc[iDb]>0 ){
-      Btree *pBt = pTab->db->aDb[iDb].pBt;
-      Pager *pPager = sqlite3BtreePager(pBt);
-      sqlite3PagerTruncateImage(pPager, pTab->aTrunc[iDb]);
-      pTab->aTrunc[iDb] = 0;
-    }
+  if( pTab->pgnoTrunc>0 ){
+    Btree *pBt = pTab->db->aDb[pTab->iDbTrunc].pBt;
+    Pager *pPager = sqlite3BtreePager(pBt);
+    sqlite3PagerTruncateImage(pPager, pTab->pgnoTrunc);
   }
+  pTab->pgnoTrunc = 0;
   return SQLITE_OK;
 }
 
+/* Cancel any pending truncate.
+*/
+static int dbpageRollbackTo(sqlite3_vtab *pVtab, int notUsed1){
+  DbpageTable *pTab = (DbpageTable *)pVtab;
+  pTab->pgnoTrunc = 0;
+  (void)notUsed1;
+  return SQLITE_OK;
+}
 
 /*
 ** Invoke this routine to register the "dbpage" virtual table module
@@ -474,7 +468,7 @@ int sqlite3DbpageRegister(sqlite3 *db){
     0,                            /* xRename */
     0,                            /* xSavepoint */
     0,                            /* xRelease */
-    0,                            /* xRollbackTo */
+    dbpageRollbackTo,             /* xRollbackTo */
     0,                            /* xShadowName */
     0                             /* xIntegrity */
   };
diff --git a/src/global.c b/src/global.c
index 121b3f6d6b..b4864a446c 100644
--- a/src/global.c
+++ b/src/global.c
@@ -243,7 +243,6 @@ SQLITE_WSD struct Sqlite3Config sqlite3Config = {
    SQLITE_ALLOW_COVERING_INDEX_SCAN,   /* bUseCis */
    0,                         /* bSmallMalloc */
    1,                         /* bExtraSchemaChecks */
-   sizeof(LONGDOUBLE_TYPE)>8, /* bUseLongDouble */
 #ifdef SQLITE_DEBUG
    0,                         /* bJsonSelfcheck */
 #endif
diff --git a/src/main.c b/src/main.c
index 6ab09c5560..a6935fb0f3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -159,32 +159,6 @@ char *sqlite3_temp_directory = 0;
 */
 char *sqlite3_data_directory = 0;
 
-/*
-** Determine whether or not high-precision (long double) floating point
-** math works correctly on CPU currently running.
-*/
-static SQLITE_NOINLINE int hasHighPrecisionDouble(int rc){
-  if( sizeof(LONGDOUBLE_TYPE)<=8 ){
-    /* If the size of "long double" is not more than 8, then
-    ** high-precision math is not possible. */
-    return 0;
-  }else{
-    /* Just because sizeof(long double)>8 does not mean that the underlying
-    ** hardware actually supports high-precision floating point.  For example,
-    ** clearing the 0x100 bit in the floating-point control word on Intel
-    ** processors will make long double work like double, even though long
-    ** double takes up more space.  The only way to determine if long double
-    ** actually works is to run an experiment. */
-    LONGDOUBLE_TYPE a, b, c;
-    rc++;
-    a = 1.0+rc*0.1;
-    b = 1.0e+18+rc*25.0;
-    c = a+b;
-    return b!=c;
-  }
-}
-
-
 /*
 ** Initialize SQLite. 
 **
@@ -379,13 +353,6 @@ int sqlite3_initialize(void){
     rc = SQLITE_EXTRA_INIT(0);
   }
 #endif
-
-  /* Experimentally determine if high-precision floating point is
-  ** available. */
-#ifndef SQLITE_OMIT_WSD
-  sqlite3Config.bUseLongDouble = hasHighPrecisionDouble(rc);
-#endif
-
   return rc;
 }
 
@@ -4638,24 +4605,6 @@ int sqlite3_test_control(int op, ...){
       break;
     }
 
-#if !defined(SQLITE_OMIT_WSD)
-    /* sqlite3_test_control(SQLITE_TESTCTRL_USELONGDOUBLE, int X);
-    **
-    **   X<0     Make no changes to the bUseLongDouble.  Just report value.
-    **   X==0    Disable bUseLongDouble
-    **   X==1    Enable bUseLongDouble
-    **   X>=2    Set bUseLongDouble to its default value for this platform
-    */
-    case SQLITE_TESTCTRL_USELONGDOUBLE: {
-      int b = va_arg(ap, int);
-      if( b>=2 ) b = hasHighPrecisionDouble(b);
-      if( b>=0 ) sqlite3Config.bUseLongDouble = b>0;
-      rc = sqlite3Config.bUseLongDouble!=0;
-      break;
-    }
-#endif
-
-
 #if defined(SQLITE_DEBUG) && !defined(SQLITE_OMIT_WSD)
     /* sqlite3_test_control(SQLITE_TESTCTRL_TUNE, id, *piValue)
     **
@@ -4963,7 +4912,11 @@ int sqlite3_snapshot_get(
     if( iDb==0 || iDb>1 ){
       Btree *pBt = db->aDb[iDb].pBt;
       if( SQLITE_TXN_WRITE!=sqlite3BtreeTxnState(pBt) ){
+        Pager *pPager = sqlite3BtreePager(pBt);
+        i64 dummy = 0;
+        sqlite3PagerSnapshotOpen(pPager, (sqlite3_snapshot*)&dummy);
         rc = sqlite3BtreeBeginTrans(pBt, 0, 0);
+        sqlite3PagerSnapshotOpen(pPager, 0);
         if( rc==SQLITE_OK ){
           rc = sqlite3PagerSnapshotGet(sqlite3BtreePager(pBt), ppSnapshot);
         }
diff --git a/src/shell.c.in b/src/shell.c.in
index 56f63fb190..140fd0d9de 100644
--- a/src/shell.c.in
+++ b/src/shell.c.in
@@ -631,7 +631,7 @@ static const struct {
   unsigned char w;    /* Width of the character in columns */
   int iFirst;         /* First character in a span having this width */
 } aUWidth[] = {
-   /* {0, 0x00000},  {1, 0x00020},  {0, 0x0007f},  {1, 0x000a0}, */
+   /* {1, 0x00000}, */
   {0, 0x00300},  {1, 0x00370},  {0, 0x00483},  {1, 0x00487},  {0, 0x00488},
   {1, 0x0048a},  {0, 0x00591},  {1, 0x005be},  {0, 0x005bf},  {1, 0x005c0},
   {0, 0x005c1},  {1, 0x005c3},  {0, 0x005c4},  {1, 0x005c6},  {0, 0x005c7},
@@ -709,9 +709,6 @@ int cli_wcwidth(int c){
   int iFirst, iLast;
 
   /* Fast path for common characters */
-  if( c<0x20 ) return 0;
-  if( c<0x7f ) return 1;
-  if( c<0xa0 ) return 0;
   if( c<=0x300 ) return 1;
 
   /* The general case */
@@ -9913,7 +9910,7 @@ static int do_meta_command(char *zLine, ShellState *p){
     int eMode = 0;
     int bOnce = 0;            /* 0: .output, 1: .once, 2: .excel/.www */
     int bPlain = 0;           /* --plain option */
-    static const char *zBomUtf8 = "\xef\xbb\xbf";
+    static const char *zBomUtf8 = "\357\273\277";
     const char *zBom = 0;
 
     failIfSafeMode(p, "cannot run .%s in safe mode", azArg[0]);
@@ -11260,7 +11257,6 @@ static int do_meta_command(char *zLine, ShellState *p){
     {"seek_count",         SQLITE_TESTCTRL_SEEK_COUNT,  0, ""               },
     {"sorter_mmap",        SQLITE_TESTCTRL_SORTER_MMAP, 0, "NMAX"           },
     {"tune",               SQLITE_TESTCTRL_TUNE,        1, "ID VALUE"       },
-    {"uselongdouble",  SQLITE_TESTCTRL_USELONGDOUBLE,0,"?BOOLEAN|\"default\"?"},
     };
     int testctrl = -1;
     int iCtrl = -1;
@@ -11494,21 +11490,6 @@ static int do_meta_command(char *zLine, ShellState *p){
           }
           break;
 
-        /* sqlite3_test_control(int, int) */
-        case SQLITE_TESTCTRL_USELONGDOUBLE: {
-          int opt = -1;
-          if( nArg==3 ){
-            if( cli_strcmp(azArg[2],"default")==0 ){
-              opt = 2;
-            }else{
-              opt = booleanValue(azArg[2]);
-            }
-          }
-          rc2 = sqlite3_test_control(testctrl, opt);
-          isOk = 1;
-          break;
-        }
-
         /* sqlite3_test_control(sqlite3*) */
         case SQLITE_TESTCTRL_INTERNAL_FUNCTIONS:
           rc2 = sqlite3_test_control(testctrl, p->db);
diff --git a/src/sqlite.h.in b/src/sqlite.h.in
index 72190beec5..5108d3c1e9 100644
--- a/src/sqlite.h.in
+++ b/src/sqlite.h.in
@@ -5603,7 +5603,7 @@ int sqlite3_create_window_function(
 ** This flag instructs SQLite to omit some corner-case optimizations that
 ** might disrupt the operation of the [sqlite3_value_subtype()] function,
 ** causing it to return zero rather than the correct subtype().
-** SQL functions that invokes [sqlite3_value_subtype()] should have this
+** All SQL functions that invoke [sqlite3_value_subtype()] should have this
 ** property.  If the SQLITE_SUBTYPE property is omitted, then the return
 ** value from [sqlite3_value_subtype()] might sometimes be zero even though
 ** a non-zero subtype was specified by the function argument expression.
@@ -8368,7 +8368,7 @@ int sqlite3_test_control(int op, ...);
 #define SQLITE_TESTCTRL_TRACEFLAGS              31
 #define SQLITE_TESTCTRL_TUNE                    32
 #define SQLITE_TESTCTRL_LOGEST                  33
-#define SQLITE_TESTCTRL_USELONGDOUBLE           34
+#define SQLITE_TESTCTRL_USELONGDOUBLE           34  /* NOT USED */
 #define SQLITE_TESTCTRL_LAST                    34  /* Largest TESTCTRL */
 
 /*
@@ -10543,6 +10543,14 @@ typedef struct sqlite3_snapshot {
 ** If there is not already a read-transaction open on schema S when
 ** this function is called, one is opened automatically.
 **
+** If a read-transaction is opened by this function, then it is guaranteed 
+** that the returned snapshot object may not be invalidated by a database 
+** writer or checkpointer until after the read-transaction is closed. This 
+** is not guaranteed if a read-transaction is already open when this 
+** function is called. In that case, any subsequent write or checkpoint 
+** operation on the database may invalidate the returned snapshot handle, 
+** even while the read-transaction remains open.
+**
 ** The following must be true for this function to succeed. If any of
 ** the following statements are false when sqlite3_snapshot_get() is
 ** called, SQLITE_ERROR is returned. The final value of *P is undefined
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 604f7e975e..0e0035ce60 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -638,6 +638,7 @@
 #include <string.h>
 #include <assert.h>
 #include <stddef.h>
+#include <ctype.h>
 
 /*
 ** Use a macro to replace memcpy() if compiled with SQLITE_INLINE_MEMCPY.
@@ -660,7 +661,6 @@
 # define float sqlite_int64
 # define fabs(X) ((X)<0?-(X):(X))
 # define sqlite3IsOverflow(X) 0
-# define LONGDOUBLE_TYPE sqlite_int64
 # ifndef SQLITE_BIG_DBL
 #   define SQLITE_BIG_DBL (((sqlite3_int64)1)<<50)
 # endif
@@ -835,9 +835,6 @@
 #  define INT8_TYPE signed char
 # endif
 #endif
-#ifndef LONGDOUBLE_TYPE
-# define LONGDOUBLE_TYPE long double
-#endif
 typedef sqlite_int64 i64;          /* 8-byte signed integer */
 typedef sqlite_uint64 u64;         /* 8-byte unsigned integer */
 typedef UINT32_TYPE u32;           /* 4-byte unsigned integer */
@@ -4262,7 +4259,6 @@ struct Sqlite3Config {
   u8 bUseCis;                       /* Use covering indices for full-scans */
   u8 bSmallMalloc;                  /* Avoid large memory allocations if true */
   u8 bExtraSchemaChecks;            /* Verify type,name,tbl_name in schema */
-  u8 bUseLongDouble;                /* Make use of long double */
 #ifdef SQLITE_DEBUG
   u8 bJsonSelfcheck;                /* Double-check JSON parsing */
 #endif
@@ -4637,15 +4633,6 @@ int sqlite3CantopenError(int);
 # define SQLITE_ENABLE_FTS3 1
 #endif
 
-/*
-** The ctype.h header is needed for non-ASCII systems.  It is also
-** needed by FTS3 when FTS3 is included in the amalgamation.
-*/
-#if !defined(SQLITE_ASCII) || \
-    (defined(SQLITE_ENABLE_FTS3) && defined(SQLITE_AMALGAMATION))
-# include <ctype.h>
-#endif
-
 /*
 ** The following macros mimic the standard library functions toupper(),
 ** isspace(), isalnum(), isdigit() and isxdigit(), respectively. The
diff --git a/src/test1.c b/src/test1.c
index 38ea6229ee..5af066c6b2 100644
--- a/src/test1.c
+++ b/src/test1.c
@@ -7313,37 +7313,6 @@ static int SQLITE_TCLAPI extra_schema_checks(
   return TCL_OK;
 }
 
-/*
-** tclcmd:  use_long_double BOOLEAN|"default"
-**
-** If no argument, report the current value of the use-long-double flag.
-**
-** If argument is "default", set the use-long-double flag to the default
-** value for this build, based on the size of LONGDOUBLE_TYPE.
-**
-** If argument is a boolean, set the use-long-double flag accordingly.
-**
-** Return the new setting.
-*/
-static int SQLITE_TCLAPI use_long_double(
-  ClientData clientData, /* Pointer to sqlite3_enable_XXX function */
-  Tcl_Interp *interp,    /* The TCL interpreter that invoked this command */
-  int objc,              /* Number of arguments */
-  Tcl_Obj *CONST objv[]  /* Command arguments */
-){
-  int i = -1;
-  if( objc==2 ){
-    if( strcmp(Tcl_GetString(objv[1]),"default")==0 ){
-      i = 2;
-    }else{
-      if( Tcl_GetBooleanFromObj(interp,objv[1],&i) ) return TCL_ERROR;
-    }
-  }
-  i = sqlite3_test_control(SQLITE_TESTCTRL_USELONGDOUBLE, i);
-  Tcl_SetObjResult(interp, Tcl_NewIntObj(i));
-  return TCL_OK;
-}
-
 /*
 ** tclcmd:  database_may_be_corrupt
 **
@@ -9150,7 +9119,6 @@ int Sqlitetest1_Init(Tcl_Interp *interp){
      { "reset_prng_state",              reset_prng_state,   0 },
      { "prng_seed",                     prng_seed,          0 },
      { "extra_schema_checks",           extra_schema_checks,    0},
-     { "use_long_double",               use_long_double,        0},
      { "database_never_corrupt",        database_never_corrupt, 0},
      { "database_may_be_corrupt",       database_may_be_corrupt, 0},
      { "optimization_control",          optimization_control,0},
@@ -9299,7 +9267,6 @@ int Sqlitetest1_Init(Tcl_Interp *interp){
 #endif
   };
   static int bitmask_size = sizeof(Bitmask)*8;
-  static int longdouble_size = sizeof(LONGDOUBLE_TYPE);
   int i;
   extern int sqlite3_sync_count, sqlite3_fullsync_count;
   extern int sqlite3_opentemp_count;
@@ -9400,8 +9367,6 @@ int Sqlitetest1_Init(Tcl_Interp *interp){
       (char*)&sqlite3_data_directory, TCL_LINK_STRING);
   Tcl_LinkVar(interp, "bitmask_size",
       (char*)&bitmask_size, TCL_LINK_INT|TCL_LINK_READ_ONLY);
-  Tcl_LinkVar(interp, "longdouble_size",
-      (char*)&longdouble_size, TCL_LINK_INT|TCL_LINK_READ_ONLY);
   Tcl_LinkVar(interp, "sqlite_sync_count",
       (char*)&sqlite3_sync_count, TCL_LINK_INT);
   Tcl_LinkVar(interp, "sqlite_fullsync_count",
diff --git a/src/test_config.c b/src/test_config.c
index 49527861a4..ad315c723c 100644
--- a/src/test_config.c
+++ b/src/test_config.c
@@ -512,10 +512,6 @@ static void set_options(Tcl_Interp *interp){
   Tcl_SetVar2(interp, "sqlite_options", "lookaside", "1", TCL_GLOBAL_ONLY);
 #endif
 
-Tcl_SetVar2(interp, "sqlite_options", "long_double",
-              sizeof(LONGDOUBLE_TYPE)>sizeof(double) ? "1" : "0",
-              TCL_GLOBAL_ONLY);
-
 #ifdef SQLITE_OMIT_MEMORYDB
   Tcl_SetVar2(interp, "sqlite_options", "memorydb", "0", TCL_GLOBAL_ONLY);
 #else
diff --git a/src/util.c b/src/util.c
index 0cebb474a2..9ad294016a 100644
--- a/src/util.c
+++ b/src/util.c
@@ -539,6 +539,8 @@ int sqlite3AtoF(const char *z, double *pResult, int length, u8 enc){
   int eValid = 1;  /* True exponent is either not used or is well-formed */
   int nDigit = 0;  /* Number of digits processed */
   int eType = 1;   /* 1: pure integer,  2+: fractional  -1 or less: bad UTF16 */
+  double rr[2];
+  u64 s2;
 
   assert( enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE || enc==SQLITE_UTF16BE );
   *pResult = 0.0;   /* Default return value, in case of an error */
@@ -650,68 +652,41 @@ do_atof_calc:
     e++;
   }
 
-  if( e==0 ){
-    *pResult = s;
-  }else if( sqlite3Config.bUseLongDouble ){
-    LONGDOUBLE_TYPE r = (LONGDOUBLE_TYPE)s;
-    if( e>0 ){
-      while( e>=100  ){ e-=100; r *= 1.0e+100L; }
-      while( e>=10   ){ e-=10;  r *= 1.0e+10L;  }
-      while( e>=1    ){ e-=1;   r *= 1.0e+01L;  }
-    }else{
-      while( e<=-100 ){ e+=100; r *= 1.0e-100L; }
-      while( e<=-10  ){ e+=10;  r *= 1.0e-10L;  }
-      while( e<=-1   ){ e+=1;   r *= 1.0e-01L;  }
-    }
-    assert( r>=0.0 );
-    if( r>+1.7976931348623157081452742373e+308L ){
-#ifdef INFINITY
-      *pResult = +INFINITY;
-#else
-      *pResult = 1.0e308*10.0;
+  rr[0] = (double)s;
+  s2 = (u64)rr[0];
+#if defined(_MSC_VER) && _MSC_VER<1700
+  if( s2==0x8000000000000000LL ){ s2 = 2*(u64)(0.5*rr[0]); }
 #endif
-    }else{
-      *pResult = (double)r;
+  rr[1] = s>=s2 ? (double)(s - s2) : -(double)(s2 - s);
+  if( e>0 ){
+    while( e>=100  ){
+      e -= 100;
+      dekkerMul2(rr, 1.0e+100, -1.5902891109759918046e+83);
+    }
+    while( e>=10   ){
+      e -= 10;
+      dekkerMul2(rr, 1.0e+10, 0.0);
+    }
+    while( e>=1    ){
+      e -= 1;
+      dekkerMul2(rr, 1.0e+01, 0.0);
     }
   }else{
-    double rr[2];
-    u64 s2;
-    rr[0] = (double)s;
-    s2 = (u64)rr[0];
-#if defined(_MSC_VER) && _MSC_VER<1700
-    if( s2==0x8000000000000000LL ){ s2 = 2*(u64)(0.5*rr[0]); }
-#endif
-    rr[1] = s>=s2 ? (double)(s - s2) : -(double)(s2 - s);
-    if( e>0 ){
-      while( e>=100  ){
-        e -= 100;
-        dekkerMul2(rr, 1.0e+100, -1.5902891109759918046e+83);
-      }
-      while( e>=10   ){
-        e -= 10;
-        dekkerMul2(rr, 1.0e+10, 0.0);
-      }
-      while( e>=1    ){
-        e -= 1;
-        dekkerMul2(rr, 1.0e+01, 0.0);
-      }
-    }else{
-      while( e<=-100 ){
-        e += 100;
-        dekkerMul2(rr, 1.0e-100, -1.99918998026028836196e-117);
-      }
-      while( e<=-10  ){
-        e += 10;
-        dekkerMul2(rr, 1.0e-10, -3.6432197315497741579e-27);
-      }
-      while( e<=-1   ){
-        e += 1;
-        dekkerMul2(rr, 1.0e-01, -5.5511151231257827021e-18);
-      }
+    while( e<=-100 ){
+      e += 100;
+      dekkerMul2(rr, 1.0e-100, -1.99918998026028836196e-117);
+    }
+    while( e<=-10  ){
+      e += 10;
+      dekkerMul2(rr, 1.0e-10, -3.6432197315497741579e-27);
+    }
+    while( e<=-1   ){
+      e += 1;
+      dekkerMul2(rr, 1.0e-01, -5.5511151231257827021e-18);
     }
-    *pResult = rr[0]+rr[1];
-    if( sqlite3IsNaN(*pResult) ) *pResult = 1e300*1e300;
   }
+  *pResult = rr[0]+rr[1];
+  if( sqlite3IsNaN(*pResult) ) *pResult = 1e300*1e300;
   if( sign<0 ) *pResult = -*pResult;
   assert( !sqlite3IsNaN(*pResult) );
 
@@ -1032,9 +1007,10 @@ void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
   int i;
   u64 v;
   int e, exp = 0;
+  double rr[2];
+
   p->isSpecial = 0;
   p->z = p->zBuf;
-
   assert( mxRound>0 );
 
   /* Convert negative numbers to positive.  Deal with Infinity, 0.0, and
@@ -1062,62 +1038,45 @@ void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
 
   /* Multiply r by powers of ten until it lands somewhere in between
   ** 1.0e+19 and 1.0e+17.
+  **
+  ** Use Dekker-style double-double computation to increase the
+  ** precision.
+  **
+  ** The error terms on constants like 1.0e+100 computed using the
+  ** decimal extension, for example as follows:
+  **
+  **   SELECT decimal_exp(decimal_sub('1.0e+100',decimal(1.0e+100)));
   */
-  if( sqlite3Config.bUseLongDouble ){
-    LONGDOUBLE_TYPE rr = r;
-    if( rr>=1.0e+19 ){
-      while( rr>=1.0e+119L ){ exp+=100; rr *= 1.0e-100L; }
-      while( rr>=1.0e+29L  ){ exp+=10;  rr *= 1.0e-10L;  }
-      while( rr>=1.0e+19L  ){ exp++;    rr *= 1.0e-1L;   }
-    }else{
-      while( rr<1.0e-97L   ){ exp-=100; rr *= 1.0e+100L; }
-      while( rr<1.0e+07L   ){ exp-=10;  rr *= 1.0e+10L;  }
-      while( rr<1.0e+17L   ){ exp--;    rr *= 1.0e+1L;   }
+  rr[0] = r;
+  rr[1] = 0.0;
+  if( rr[0]>9.223372036854774784e+18 ){
+    while( rr[0]>9.223372036854774784e+118 ){
+      exp += 100;
+      dekkerMul2(rr, 1.0e-100, -1.99918998026028836196e-117);
+    }
+    while( rr[0]>9.223372036854774784e+28 ){
+      exp += 10;
+      dekkerMul2(rr, 1.0e-10, -3.6432197315497741579e-27);
+    }
+    while( rr[0]>9.223372036854774784e+18 ){
+      exp += 1;
+      dekkerMul2(rr, 1.0e-01, -5.5511151231257827021e-18);
     }
-    v = (u64)rr;
   }else{
-    /* If high-precision floating point is not available using "long double",
-    ** then use Dekker-style double-double computation to increase the
-    ** precision.
-    **
-    ** The error terms on constants like 1.0e+100 computed using the
-    ** decimal extension, for example as follows:
-    **
-    **   SELECT decimal_exp(decimal_sub('1.0e+100',decimal(1.0e+100)));
-    */
-    double rr[2];
-    rr[0] = r;
-    rr[1] = 0.0;
-    if( rr[0]>9.223372036854774784e+18 ){
-      while( rr[0]>9.223372036854774784e+118 ){
-        exp += 100;
-        dekkerMul2(rr, 1.0e-100, -1.99918998026028836196e-117);
-      }
-      while( rr[0]>9.223372036854774784e+28 ){
-        exp += 10;
-        dekkerMul2(rr, 1.0e-10, -3.6432197315497741579e-27);
-      }
-      while( rr[0]>9.223372036854774784e+18 ){
-        exp += 1;
-        dekkerMul2(rr, 1.0e-01, -5.5511151231257827021e-18);
-      }
-    }else{
-      while( rr[0]<9.223372036854774784e-83  ){
-        exp -= 100;
-        dekkerMul2(rr, 1.0e+100, -1.5902891109759918046e+83);
-      }
-      while( rr[0]<9.223372036854774784e+07  ){
-        exp -= 10;
-        dekkerMul2(rr, 1.0e+10, 0.0);
-      }
-      while( rr[0]<9.22337203685477478e+17  ){
-        exp -= 1;
-        dekkerMul2(rr, 1.0e+01, 0.0);
-      }
+    while( rr[0]<9.223372036854774784e-83  ){
+      exp -= 100;
+      dekkerMul2(rr, 1.0e+100, -1.5902891109759918046e+83);
+    }
+    while( rr[0]<9.223372036854774784e+07  ){
+      exp -= 10;
+      dekkerMul2(rr, 1.0e+10, 0.0);
+    }
+    while( rr[0]<9.22337203685477478e+17  ){
+      exp -= 1;
+      dekkerMul2(rr, 1.0e+01, 0.0);
     }
-    v = rr[1]<0.0 ? (u64)rr[0]-(u64)(-rr[1]) : (u64)rr[0]+(u64)rr[1];
   }
-
+  v = rr[1]<0.0 ? (u64)rr[0]-(u64)(-rr[1]) : (u64)rr[0]+(u64)rr[1];
 
   /* Extract significant digits. */
   i = sizeof(p->zBuf)-1;
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index a66bdecffb..8120536b98 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -4512,7 +4512,7 @@ SQLITE_NOINLINE int sqlite3BlobCompare(const Mem *pB1, const Mem *pB2){
 ** We must use separate SQLITE_NOINLINE functions here, since otherwise
 ** optimizer code movement causes gcov to become very confused.
 */
-#if  defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_DEBUG)
+#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_DEBUG)
 static int SQLITE_NOINLINE doubleLt(double a, double b){ return a<b; }
 static int SQLITE_NOINLINE doubleEq(double a, double b){ return a==b; }
 #endif
@@ -4527,13 +4527,6 @@ int sqlite3IntFloatCompare(i64 i, double r){
     /* SQLite considers NaN to be a NULL. And all integer values are greater
     ** than NULL */
     return 1;
-  }
-  if( sqlite3Config.bUseLongDouble ){
-    LONGDOUBLE_TYPE x = (LONGDOUBLE_TYPE)i;
-    testcase( x<r );
-    testcase( x>r );
-    testcase( x==r );
-    return (x<r) ? -1 : (x>r);
   }else{
     i64 y;
     if( r<-9223372036854775808.0 ) return +1;
diff --git a/src/wal.c b/src/wal.c
index 89106038b8..f4aa663fd3 100644
--- a/src/wal.c
+++ b/src/wal.c
@@ -541,6 +541,7 @@ struct Wal {
 #endif
 #ifdef SQLITE_ENABLE_SNAPSHOT
   WalIndexHdr *pSnapshot;    /* Start transaction here if not NULL */
+  int bGetSnapshot;          /* Transaction opened for sqlite3_get_snapshot() */
 #endif
 #ifdef SQLITE_ENABLE_SETLK_TIMEOUT
   sqlite3 *db;
@@ -3097,7 +3098,7 @@ static int walTryBeginRead(Wal *pWal, int *pChanged, int useWal, int *pCnt){
   SEH_INJECT_FAULT;
   if( !useWal && AtomicLoad(&pInfo->nBackfill)==pWal->hdr.mxFrame
 #ifdef SQLITE_ENABLE_SNAPSHOT
-   && (pWal->pSnapshot==0 || pWal->hdr.mxFrame==0)
+   && ((pWal->bGetSnapshot==0 && pWal->pSnapshot==0) || pWal->hdr.mxFrame==0)
 #endif
   ){
     /* The WAL has been completely backfilled (or it is empty).
@@ -4497,7 +4498,20 @@ void sqlite3WalSnapshotOpen(
   Wal *pWal,
   sqlite3_snapshot *pSnapshot
 ){
-  pWal->pSnapshot = (WalIndexHdr*)pSnapshot;
+  if( pSnapshot && ((WalIndexHdr*)pSnapshot)->iVersion==0 ){
+    /* iVersion==0 means that this is a call to sqlite3_snapshot_get().  In
+    ** this case set the bGetSnapshot flag so that if the call to
+    ** sqlite3_snapshot_get() is about to read transaction on this wal 
+    ** file, it does not take read-lock 0 if the wal file has been completely
+    ** checkpointed. Taking read-lock 0 would work, but then it would be
+    ** possible for a subsequent writer to destroy the snapshot even while 
+    ** this connection is holding its read-transaction open. This is contrary
+    ** to user expectations, so we avoid it by not taking read-lock 0. */
+    pWal->bGetSnapshot = 1;
+  }else{
+    pWal->pSnapshot = (WalIndexHdr*)pSnapshot;
+    pWal->bGetSnapshot = 0;
+  }
 }
 
 /*
diff --git a/test/atof1.test b/test/atof1.test
index 95f443ce0d..1a5db2cc79 100644
--- a/test/atof1.test
+++ b/test/atof1.test
@@ -15,7 +15,7 @@
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
 
-set mxpow [expr {[use_long_double]?100:35}]
+set mxpow 35
 expr srand(1)
 for {set i 1} {$i<20000} {incr i} {
   set pow [expr {int((rand()-0.5)*$mxpow)}]
diff --git a/test/cast.test b/test/cast.test
index 7f48ed80bf..1c9071d775 100644
--- a/test/cast.test
+++ b/test/cast.test
@@ -262,11 +262,9 @@ do_test cast-3.12 {
 do_realnum_test cast-3.13 {
   execsql {SELECT CAST('9223372036854774800' AS real)}
 } 9.22337203685477e+18
-ifcapable long_double {
-  do_test cast-3.14 {
-    execsql {SELECT CAST(CAST('9223372036854774800' AS real) AS integer)}
-  } 9223372036854774784
-}
+do_test cast-3.14 {
+  execsql {SELECT CAST(CAST('9223372036854774800' AS real) AS integer)}
+} 9223372036854774784
 do_test cast-3.15 {
   execsql {SELECT CAST('-9223372036854774800' AS integer)}
 } -9223372036854774800
@@ -276,11 +274,9 @@ do_test cast-3.16 {
 do_realnum_test cast-3.17 {
   execsql {SELECT CAST('-9223372036854774800' AS real)}
 } -9.22337203685477e+18
-ifcapable long_double {
-  do_test cast-3.18 {
-    execsql {SELECT CAST(CAST('-9223372036854774800' AS real) AS integer)}
-  } -9223372036854774784
-}
+do_test cast-3.18 {
+  execsql {SELECT CAST(CAST('-9223372036854774800' AS real) AS integer)}
+} -9223372036854774784
 if {[db eval {PRAGMA encoding}]=="UTF-8"} {
   do_test cast-3.21 {
     execsql {SELECT CAST(x'39323233333732303336383534373734383030' AS integer)}
@@ -291,14 +287,12 @@ if {[db eval {PRAGMA encoding}]=="UTF-8"} {
   do_realnum_test cast-3.23 {
     execsql {SELECT CAST(x'39323233333732303336383534373734383030' AS real)}
   } 9.22337203685477e+18
-  ifcapable long_double {
-    do_test cast-3.24 {
-      execsql {
-        SELECT CAST(CAST(x'39323233333732303336383534373734383030' AS real)
-                    AS integer)
-      }
-    } 9223372036854774784
-  }
+  do_test cast-3.24 {
+    execsql {
+      SELECT CAST(CAST(x'39323233333732303336383534373734383030' AS real)
+                  AS integer)
+    }
+  } 9223372036854774784
 }
 do_test cast-3.31 {
   execsql {SELECT CAST(NULL AS numeric)}
diff --git a/test/fp-speed-1.c b/test/fp-speed-1.c
index 5eeb95d348..cb4e0409c3 100644
--- a/test/fp-speed-1.c
+++ b/test/fp-speed-1.c
@@ -12,7 +12,6 @@
 **
 **    time ./a.out 0 10000000     <-- standard library
 **    time ./a.out 1 10000000     <-- SQLite
-**    time ./a.out 2 10000000     <-- SQLite with long-double disabled
 */
 static double aVal[] = {
   -1.0163830486285643089e+063,
@@ -150,15 +149,6 @@ int main(int argc, char **argv){
       }
       break;
     }
-    case 2: {
-      printf("Doing %d calls to sqlite3_snprintf() without long double\n", cnt);
-      sqlite3_test_control(SQLITE_TESTCTRL_USELONGDOUBLE, 0);
-      for(i=0; i<cnt; i++){
-        sqlite3_snprintf(sizeof(zBuf), zBuf, "%!.26g", aVal[i%NN]);
-      }
-      break;
-    }
-
   }
   return 0;
 }
diff --git a/test/func.test b/test/func.test
index a3ecd4e30b..228adcc2d6 100644
--- a/test/func.test
+++ b/test/func.test
@@ -261,9 +261,6 @@ ifcapable floatingpoint {
     catchsql {SELECT round(b,2.0) FROM t1 ORDER BY b}
   } {0 {-2.0 1.23 2.0}}
   # Verify some values reported on the mailing list.
-  # Some of these fail on MSVC builds with 64-bit
-  # long doubles, but not on GCC builds with 80-bit
-  # long doubles.
   for {set i 1} {$i<999} {incr i} {
     set x1 [expr 40222.5 + $i]
     set x2 [expr 40223.0 + $i]
diff --git a/test/func4.test b/test/func4.test
index 56cc9063a1..fb74b7d8d5 100644
--- a/test/func4.test
+++ b/test/func4.test
@@ -37,7 +37,7 @@ set highPrecision(3) [expr \
     {[db eval {SELECT toreal(9007199254740992 + 1);}] eq {{}}}]
 
 if {!$highPrecision(1) || !$highPrecision(2) || !$highPrecision(3)} {
-  puts "NOTICE: use_long_double: [use_long_double] \
+  puts "NOTICE:\
         highPrecision: $highPrecision(1) $highPrecision(2) $highPrecision(3)"
 }
 
diff --git a/test/snapshot3.test b/test/snapshot3.test
index 4dca202b1c..470d463a66 100644
--- a/test/snapshot3.test
+++ b/test/snapshot3.test
@@ -96,4 +96,43 @@ do_test 1.8 {
   list [catch { sqlite3_snapshot_open_blob db3 main $snap } msg] $msg
 } {1 SQLITE_ERROR_SNAPSHOT}
 
+#-------------------------------------------------------------------------
+reset_db
+do_execsql_test 2.0 {
+  PRAGMA journal_mode = wal;
+  CREATE TABLE t1(a, b);
+  INSERT INTO t1 VALUES(1, 2);
+  INSERT INTO t1 VALUES(3, 4);
+} {wal}
+
+sqlite3 db2 test.db
+sqlite3 db3 test.db
+do_execsql_test -db db2 2.0.1 {
+  SELECT * FROM t1
+} {1 2 3 4}
+do_execsql_test -db db3 2.0.2 {
+  SELECT * FROM t1
+} {1 2 3 4}
+
+do_execsql_test -db db2 2.2 {
+  PRAGMA wal_checkpoint;
+} {0 4 4}
+
+do_test 2.1 {
+  db eval { BEGIN }
+  set snap [sqlite3_snapshot_get db main]
+  set {} {}
+} {}
+
+do_execsql_test -db db2 2.3 {
+  INSERT INTO t1 VALUES(5, 6);
+} {}
+
+do_test 2.2 {
+  execsql { BEGIN } db3
+  sqlite3_snapshot_open db3 main $snap
+} {}
+
+sqlite3_snapshot_free $snap
+
 finish_test
diff --git a/test/speedtest1.c b/test/speedtest1.c
index 5709423818..b0817858ae 100644
--- a/test/speedtest1.c
+++ b/test/speedtest1.c
@@ -21,7 +21,6 @@ static const char zHelp[] =
   "  --memdb             Use an in-memory database\n"
   "  --mmap SZ           MMAP the first SZ bytes of the database file\n"
   "  --multithread       Set multithreaded mode\n"
-  "  --nolongdouble      Disable the use of long double\n"
   "  --nomemstat         Disable memory statistics\n"
   "  --nomutex           Open db with SQLITE_OPEN_NOMUTEX\n"
   "  --nosync            Set PRAGMA synchronous=OFF\n"
@@ -2352,10 +2351,6 @@ int main(int argc, char **argv){
         ARGC_VALUE_CHECK(1);
         mmapSize = integerValue(argv[++i]);
  #endif
-      }else if( strcmp(z,"nolongdouble")==0 ){
-#ifdef SQLITE_TESTCTRL_USELONGDOUBLE
-        sqlite3_test_control(SQLITE_TESTCTRL_USELONGDOUBLE, 0);
-#endif       
       }else if( strcmp(z,"nomutex")==0 ){
         openFlags |= SQLITE_OPEN_NOMUTEX;
       }else if( strcmp(z,"nosync")==0 ){
diff --git a/test/testrunner_data.tcl b/test/testrunner_data.tcl
index 78f28bbf8e..98b3669a33 100644
--- a/test/testrunner_data.tcl
+++ b/test/testrunner_data.tcl
@@ -203,7 +203,6 @@ namespace eval trd {
     -DSQLITE_MAX_ATTACHED=125
     -DSQLITE_MAX_MMAP_SIZE=12884901888
     -DSQLITE_ENABLE_SORTER_MMAP=1
-    -DLONGDOUBLE_TYPE=double
     --enable-session
   }
   set build(Device-One) {
@@ -343,7 +342,6 @@ namespace eval trd {
     -DSQLITE_ENABLE_FTS4
     -DSQLITE_ENABLE_RTREE
     -DSQLITE_ENABLE_HIDDEN_COLUMNS
-    -DLONGDOUBLE_TYPE=double
     -DCONFIG_SLOWDOWN_FACTOR=8.0
   }
 
diff --git a/tool/speed-check.sh b/tool/speed-check.sh
index 5d425c3b37..8a9e67a38b 100644
--- a/tool/speed-check.sh
+++ b/tool/speed-check.sh
@@ -99,9 +99,6 @@ while test "$1" != ""; do
     --stmtcache)
         shift; SPEEDTEST_OPTS="$SPEEDTEST_OPTS --stmtcache $1"
         ;;
-    --nolongdouble)
-        SPEEDTEST_OPTS="$SPEEDTEST_OPTS --nolongdouble"
-        ;;
     --checkpoint)
         SPEEDTEST_OPTS="$SPEEDTEST_OPTS --checkpoint"
         ;;
diff --git a/tool/sqlite3-rsync.c b/tool/sqlite3-rsync.c
index 1be206a758..216390c182 100644
--- a/tool/sqlite3-rsync.c
+++ b/tool/sqlite3-rsync.c
@@ -1456,15 +1456,18 @@ static void replicaSide(SQLiteRsync *p){
         }else if( p->nErr ){
           runSql(p, "ROLLBACK");
         }else{
-          int rc;
-          sqlite3_bind_int64(pIns, 1, nOPage);
-          sqlite3_bind_null(pIns, 2);
-          rc = sqlite3_step(pIns);
-          if( rc!=SQLITE_DONE ){
-            reportError(p, "SQL statement [%s] failed (pgno=%u, data=NULL): %s",
-                   sqlite3_sql(pIns), nOPage, sqlite3_errmsg(p->db));
+          if( nOPage<0xffffffff ){
+            int rc;
+            sqlite3_bind_int64(pIns, 1, nOPage+1);
+            sqlite3_bind_null(pIns, 2);
+            rc = sqlite3_step(pIns);
+            if( rc!=SQLITE_DONE ){
+              reportError(p,
+                  "SQL statement [%s] failed (pgno=%u, data=NULL): %s",
+                  sqlite3_sql(pIns), nOPage, sqlite3_errmsg(p->db));
+            }
+            sqlite3_reset(pIns);
           }
-          sqlite3_reset(pIns);
           p->nPage = nOPage;
           runSql(p, "COMMIT");
         }