diff --git a/ext/session/session1.test b/ext/session/session1.test
index e97aa3c20d..09d35af7fc 100644
--- a/ext/session/session1.test
+++ b/ext/session/session1.test
@@ -569,5 +569,17 @@ do_changeset_test 10.1.2 S "
 "
 do_test 10.1.4 { S delete } {}
 
+#-------------------------------------------------------------------------
+# Test the effect of updating a column from 0.0 to 0.0.
+#
+reset_db
+do_execsql_test 11.1 {
+  CREATE TABLE t1(a INTEGER PRIMARY KEY, b REAL);
+  INSERT INTO t1 VALUES(1, 0.0);
+}
+do_iterator_test 11.2 * {
+  UPDATE t1 SET b = 0.0;
+} {
+}
 
 finish_test
diff --git a/manifest b/manifest
index 28f26abfa4..95b8a540f4 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Add\s".mode\squote"\sto\sthe\scommand-line\sshell.
-D 2016-10-21T17:39:30.026
+C In\sthe\ssessions\smodule,\savoid\srecording\sa\schange\sif\san\sUPDATE\sstatement\noverwrites\sa\scolumn\swith\sREAL\saffinity\scontaining\san\sinteger\svalue\swith\sthe\ssame\svalue.
+D 2016-10-21T21:21:45.978
 F Makefile.in 6fd48ffcf7c2deea7499062d1f3747f986c19678
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 5151cc64c4c05f3455f4f692ad11410a810d937f
@@ -284,7 +284,7 @@ F ext/rtree/sqlite3rtree.h 9c5777af3d2921c7b4ae4954e8e5697502289d28
 F ext/rtree/tkt3363.test 142ab96eded44a3615ec79fba98c7bde7d0f96de
 F ext/rtree/viewrtree.tcl eea6224b3553599ae665b239bd827e182b466024
 F ext/session/changeset.c 4ccbaa4531944c24584bf6a61ba3a39c62b6267a
-F ext/session/session1.test 98f384736e2bc21ccf5ed81bdadcff4ad863393b
+F ext/session/session1.test e5125b216d1e8c91e0984b361b0b68529e7c5dfb
 F ext/session/session2.test 284de45abae4cc1082bc52012ee81521d5ac58e0
 F ext/session/session3.test a7a9ce59b8d1e49e2cc23d81421ac485be0eea01
 F ext/session/session4.test 457b02bdc349eb01151e54de014df77abd3c08c8
@@ -456,9 +456,9 @@ F src/util.c 3e2da6101888d073e79ecc6af5e0a2f70fa1e498
 F src/vacuum.c 913970b9d86dd6c2b8063ef1af421880f1464ec3
 F src/vdbe.c c93ae647b3b302234f3593fd686577216aa22543
 F src/vdbe.h c044be7050ac6bf596eecc6ab159f5dbc020a3b7
-F src/vdbeInt.h 0a18713d0a2fec6807d076bd333d9bf3e57530cd
-F src/vdbeapi.c 8272f9342c39ab8d7eb4b9decc6caa7bc75b7d83
-F src/vdbeaux.c 7229203e4e4a3b6eaeeddc807c2287d912c0da74
+F src/vdbeInt.h d8a56a491b752dbb5f671963b8c861ec72ea875e
+F src/vdbeapi.c 97129bec6b1553da50d8e73f523c278bda66d9f6
+F src/vdbeaux.c 52d9b840859f260ce8418be9333dd77c902e1c74
 F src/vdbeblob.c 3e82a797b60c3b9fed7b8de8c539ca7607874937
 F src/vdbemem.c fcdd73a2001a673f48a244a77b1038928ae729c9
 F src/vdbesort.c 91fda3909326860382b0ca8aa251e609c6a9d62c
@@ -1527,7 +1527,10 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P b54c15f11796a75683eec4b502a22ccb87d621c6
-R cdb213453699e4a8a0bded009eb336d4
-U drh
-Z 3ba463b9129586b08f555ed8d54aa9f2
+P c4f5fa78cd8207ce1e46e32e632b8f6ee86047e1
+R c528e2d870af682535c32fe7ab38cc9b
+T *branch * sessions-fix
+T *sym-sessions-fix *
+T -sym-trunk *
+U dan
+Z 40897c5531031ce2803a5defa0bd4f02
diff --git a/manifest.uuid b/manifest.uuid
index 7f3cd83980..2b5d9b1434 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-c4f5fa78cd8207ce1e46e32e632b8f6ee86047e1
\ No newline at end of file
+b861328ab9ceec6926d97658c3606e6ae9ad39bf
\ No newline at end of file
diff --git a/src/vdbeInt.h b/src/vdbeInt.h
index 1c6ee3f63b..86445cef66 100644
--- a/src/vdbeInt.h
+++ b/src/vdbeInt.h
@@ -430,8 +430,8 @@ struct PreUpdate {
   int iNewReg;                    /* Register for new.* values */
   i64 iKey1;                      /* First key value passed to hook */
   i64 iKey2;                      /* Second key value passed to hook */
-  int iPKey;                      /* If not negative index of IPK column */
   Mem *aNew;                      /* Array of new.* values */
+  Table *pTab;                    /* Schema object being upated */          
 };
 
 /*
diff --git a/src/vdbeapi.c b/src/vdbeapi.c
index 5956943af0..645ef1c864 100644
--- a/src/vdbeapi.c
+++ b/src/vdbeapi.c
@@ -1710,9 +1710,14 @@ int sqlite3_preupdate_old(sqlite3 *db, int iIdx, sqlite3_value **ppValue){
   if( iIdx>=p->pUnpacked->nField ){
     *ppValue = (sqlite3_value *)columnNullValue();
   }else{
+    Mem *pMem = *ppValue = &p->pUnpacked->aMem[iIdx];
     *ppValue = &p->pUnpacked->aMem[iIdx];
-    if( iIdx==p->iPKey ){
-      sqlite3VdbeMemSetInt64(*ppValue, p->iKey1);
+    if( iIdx==p->pTab->iPKey ){
+      sqlite3VdbeMemSetInt64(pMem, p->iKey1);
+    }else if( p->pTab->aCol[iIdx].affinity==SQLITE_AFF_REAL ){
+      if( pMem->flags & MEM_Int ){
+        sqlite3VdbeMemRealify(pMem);
+      }
     }
   }
 
@@ -1789,7 +1794,7 @@ int sqlite3_preupdate_new(sqlite3 *db, int iIdx, sqlite3_value **ppValue){
       pMem = (sqlite3_value *)columnNullValue();
     }else{
       pMem = &pUnpack->aMem[iIdx];
-      if( iIdx==p->iPKey ){
+      if( iIdx==p->pTab->iPKey ){
         sqlite3VdbeMemSetInt64(pMem, p->iKey2);
       }
     }
@@ -1810,7 +1815,7 @@ int sqlite3_preupdate_new(sqlite3 *db, int iIdx, sqlite3_value **ppValue){
     assert( iIdx>=0 && iIdx<p->pCsr->nField );
     pMem = &p->aNew[iIdx];
     if( pMem->flags==0 ){
-      if( iIdx==p->iPKey ){
+      if( iIdx==p->pTab->iPKey ){
         sqlite3VdbeMemSetInt64(pMem, p->iKey2);
       }else{
         rc = sqlite3VdbeMemCopy(pMem, &p->v->aMem[p->iNewReg+1+iIdx]);
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index df4fb2cdd0..596ab30c7b 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -4617,7 +4617,7 @@ void sqlite3VdbePreUpdateHook(
   preupdate.keyinfo.aSortOrder = (u8*)&fakeSortOrder;
   preupdate.iKey1 = iKey1;
   preupdate.iKey2 = iKey2;
-  preupdate.iPKey = pTab->iPKey;
+  preupdate.pTab = pTab;
 
   db->pPreUpdate = &preupdate;
   db->xPreUpdateCallback(db->pPreUpdateArg, db, op, zDb, zTbl, iKey1, iKey2);