diff --git a/ext/wasm/api/sqlite3-api-opfs.js b/ext/wasm/api/sqlite3-api-opfs.js
index a4516513cb..1a89432c5f 100644
--- a/ext/wasm/api/sqlite3-api-opfs.js
+++ b/ext/wasm/api/sqlite3-api-opfs.js
@@ -316,19 +316,27 @@ const installOpfsVfs = function callee(options){
     */
     state.sq3Codes = Object.create(null);
     [
-      'SQLITE_ERROR', 'SQLITE_IOERR',
-      'SQLITE_NOTFOUND', 'SQLITE_MISUSE',
-      'SQLITE_IOERR_READ', 'SQLITE_IOERR_SHORT_READ',
-      'SQLITE_IOERR_WRITE', 'SQLITE_IOERR_FSYNC',
-      'SQLITE_IOERR_TRUNCATE', 'SQLITE_IOERR_DELETE',
-      'SQLITE_IOERR_ACCESS', 'SQLITE_IOERR_CLOSE',
+      'SQLITE_ERROR',
+      'SQLITE_IOERR',
+      'SQLITE_IOERR_ACCESS',
+      'SQLITE_IOERR_CLOSE',
       'SQLITE_IOERR_DELETE',
-      'SQLITE_LOCK_NONE',
-      'SQLITE_LOCK_SHARED',
-      'SQLITE_LOCK_RESERVED',
-      'SQLITE_LOCK_PENDING',
+      'SQLITE_IOERR_FSYNC',
+      'SQLITE_IOERR_LOCK',
+      'SQLITE_IOERR_READ',
+      'SQLITE_IOERR_SHORT_READ',
+      'SQLITE_IOERR_TRUNCATE',
+      'SQLITE_IOERR_UNLOCK',
+      'SQLITE_IOERR_WRITE',
       'SQLITE_LOCK_EXCLUSIVE',
-      'SQLITE_OPEN_CREATE', 'SQLITE_OPEN_DELETEONCLOSE',
+      'SQLITE_LOCK_NONE',
+      'SQLITE_LOCK_PENDING',
+      'SQLITE_LOCK_RESERVED',
+      'SQLITE_LOCK_SHARED',
+      'SQLITE_MISUSE',
+      'SQLITE_NOTFOUND',
+      'SQLITE_OPEN_CREATE',
+      'SQLITE_OPEN_DELETEONCLOSE',
       'SQLITE_OPEN_READONLY'
     ].forEach((k)=>{
       if(undefined === (state.sq3Codes[k] = capi[k])){
diff --git a/ext/wasm/api/sqlite3-opfs-async-proxy.js b/ext/wasm/api/sqlite3-opfs-async-proxy.js
index d32390f07d..71c822c1f2 100644
--- a/ext/wasm/api/sqlite3-opfs-async-proxy.js
+++ b/ext/wasm/api/sqlite3-opfs-async-proxy.js
@@ -135,6 +135,25 @@ const getDirForFilename = async function f(absFilename, createDirs = false){
   return [dh, filename];
 };
 
+/**
+   An error class specifically for use with getSyncHandle(), the goal
+   of which is to eventually be able to distinguish unambiguously
+   between locking-related failures and other types, noting that we
+   cannot currently do so because createSyncAccessHandle() does not
+   define its exceptions in the required level of detail.
+*/
+class GetSyncHandleError extends Error {
+  constructor(errorObject, ...msg){
+    super();
+    this.error = errorObject;
+    this.message = [
+      ...msg, ': Original exception ['+errorObject.name+']:',
+      errorObject.message
+    ].join(' ');
+    this.name = 'GetSyncHandleError';
+  }
+};
+
 /**
    Returns the sync access handle associated with the given file
    handle object (which must be a valid handle object, as created by
@@ -154,16 +173,17 @@ const getSyncHandle = async (fh)=>{
     let i = 1, ms = msBase;
     for(; true; ms = msBase * ++i){
       try {
-        //if(i<3) toss("Just testing.");
+        //if(i<3) toss("Just testing getSyncHandle() wait-and-retry.");
         //TODO? A config option which tells it to throw here
         //randomly every now and then, for testing purposes.
         fh.syncHandle = await fh.fileHandle.createSyncAccessHandle();
         break;
       }catch(e){
         if(i === maxTries){
-          toss("Error getting sync handle.",maxTries,
-               "attempts failed. ",fh.filenameAbs, ":", e.message);
-          throw e;
+          throw new GetSyncHandleError(
+            e, "Error getting sync handle.",maxTries,
+            "attempts failed.",fh.filenameAbs
+          );
         }
         warn("Error getting sync handle. Waiting",ms,
               "ms and trying again.",fh.filenameAbs,e);
@@ -199,7 +219,7 @@ const closeSyncHandle = async (fh)=>{
    Atomics.notify()'s it.
 */
 const storeAndNotify = (opName, value)=>{
-  log(opName+"() => notify(",state.opIds.rc,",",value,")");
+  log(opName+"() => notify(",value,")");
   Atomics.store(state.sabOPView, state.opIds.rc, value);
   Atomics.notify(state.sabOPView, state.opIds.rc);
 };
@@ -371,18 +391,18 @@ const vfsAsyncImpls = {
   xFileSize: async function(fid/*sqlite3_file pointer*/){
     mTimeStart('xFileSize');
     const fh = __openFiles[fid];
-    let sz;
+    let rc;
     wTimeStart('xFileSize');
     try{
-      sz = await (await getSyncHandle(fh)).getSize();
-      state.s11n.serialize(Number(sz));
-      sz = 0;
+      rc = await (await getSyncHandle(fh)).getSize();
+      state.s11n.serialize(Number(rc));
+      rc = 0;
     }catch(e){
       state.s11n.storeException(2,e);
-      sz = state.sq3Codes.SQLITE_IOERR;
+      rc = state.sq3Codes.SQLITE_IOERR;
     }
     wTimeEnd();
-    storeAndNotify('xFileSize', sz);
+    storeAndNotify('xFileSize', rc);
     mTimeEnd();
   },
   xLock: async function(fid/*sqlite3_file pointer*/,
@@ -395,7 +415,7 @@ const vfsAsyncImpls = {
       try { await getSyncHandle(fh) }
       catch(e){
         state.s11n.storeException(1,e);
-        rc = state.sq3Codes.SQLITE_IOERR;
+        rc = state.sq3Codes.SQLITE_IOERR_LOCK;
       }
       wTimeEnd();
     }
@@ -480,6 +500,7 @@ const vfsAsyncImpls = {
         await fh.syncHandle.flush();
       }catch(e){
         state.s11n.storeException(2,e);
+        rc = state.sq3Codes.SQLITE_IOERR_FSYNC;
       }
       wTimeEnd();
     }
@@ -514,7 +535,7 @@ const vfsAsyncImpls = {
       try { await closeSyncHandle(fh) }
       catch(e){
         state.s11n.storeException(1,e);
-        rc = state.sq3Codes.SQLITE_IOERR;
+        rc = state.sq3Codes.SQLITE_IOERR_UNLOCK;
       }
       wTimeEnd();
     }
@@ -641,7 +662,7 @@ const initS11n = ()=>{
   state.s11n.storeException = state.asyncS11nExceptions
     ? ((priority,e)=>{
       if(priority<=state.asyncS11nExceptions){
-        state.s11n.serialize(e.message);
+        state.s11n.serialize([e.name,': ',e.message].join(''));
       }
     })
     : ()=>{};
diff --git a/manifest b/manifest
index 24403f2ca2..022d02a5b3 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Add\soo1.DB.exec()\s'returnValue'\soption,\swhich\sspecifies\swhat\sexec()\sshould\sreturn.\sDefaults\sto\sthe\sdb\sobject\sand\senables\sdirect\sreturn\sof\sthe\sresult\srows\sarray\sor\sa\slist\sof\sthe\sindividual\sSQL\sstatements.\sOther\scode-adjacent\sinternal\scleanups.
-D 2022-10-31T11:09:14.111
+C Internal\stweaks\sto\sthe\sOPFS\sVFS\sresult\scodes.
+D 2022-10-31T11:53:34.287
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -501,11 +501,11 @@ F ext/wasm/api/pre-js.js 287e462f969342b032c03900e668099fa1471d852df7a472de5bc34
 F ext/wasm/api/sqlite3-api-cleanup.js ecdc69dbfccfe26146f04799fcfd4a6f5790d46e7e3b9b6e9b0491f92ed8ae34
 F ext/wasm/api/sqlite3-api-glue.js b87543534821ecfa56fc0d0cd153a115fa974e70d6217964baf6e93ef8d25fb1
 F ext/wasm/api/sqlite3-api-oo1.js 4028bc2bac7e3ae2d23b7c99828155b4a06da006b51dc2a929bc0db26337370d
-F ext/wasm/api/sqlite3-api-opfs.js c67cbe0b1451ec43bc6b3199e13453e1ca56d718a75c0498253b0d479c336256
+F ext/wasm/api/sqlite3-api-opfs.js 6880cc79a4d1b6075942298d9d1ab07e24d81fbd9e5fe6b7c797b86e4b2af596
 F ext/wasm/api/sqlite3-api-prologue.js 873986ca150c79510f647b910f8349bc71b14db21e444cab3b9fad9c4f39ffc7
 F ext/wasm/api/sqlite3-api-worker1.js efdca1b42299d80b54f366d15a8fc5343f3b3e9e3647e5c1fd6f3ee1015e501b
 F ext/wasm/api/sqlite3-license-version-header.js a661182fc93fc2cf212dfd0b987f8e138a3ac98f850b1112e29b5fbdaecc87c3
-F ext/wasm/api/sqlite3-opfs-async-proxy.js 29f6f5c314c2956e77573c6ab975c2455a0839721ed44f38004382c2a1463ab5
+F ext/wasm/api/sqlite3-opfs-async-proxy.js b2264efef84c4a0af5dab426d7573d8b4ee5af3a25ba108b709a835a613c5e36
 F ext/wasm/api/sqlite3-wasi.h 25356084cfe0d40458a902afb465df8c21fc4152c1d0a59b563a3fba59a068f9
 F ext/wasm/api/sqlite3-wasm.c 14ac9c03f6585332f882703f3427f11ffe8ffe8b6c0e252be2c518f7aac6ab6a
 F ext/wasm/api/sqlite3-worker1-promiser.js 0c7a9826dbf82a5ed4e4f7bf7816e825a52aff253afbf3350431f5773faf0e4b
@@ -2054,8 +2054,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P e02c697281a777c33070168af784b2d291397e488244a217620897f40aed7158
-R 26339704ab975fcc1e6818338a87c2a1
+P 69d36a6aa5e2cd79d26c0fd3e0d20fe8838fd1be97db07725233bfff1dfe6643
+R a5a69989c955a2bef03fc5f6b9426b6e
 U stephan
-Z 2aa3561d4216c084633673f53cc5adc1
+Z 2e8ea5a9464277cec17ca6c43e6fd2fa
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 52bd63380e..2c99a664e4 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-69d36a6aa5e2cd79d26c0fd3e0d20fe8838fd1be97db07725233bfff1dfe6643
\ No newline at end of file
+32e1a2d2eb8738ae1635e413829f6cf7f64c63d2a86b72940a573de89948e529
\ No newline at end of file