diff --git a/sources/MVCFramework.ActiveRecord.pas b/sources/MVCFramework.ActiveRecord.pas
index a4080123..53f8af98 100644
--- a/sources/MVCFramework.ActiveRecord.pas
+++ b/sources/MVCFramework.ActiveRecord.pas
@@ -2748,39 +2748,42 @@ var
 begin
   lUnitOfWork := TMVCUnitOfWork<T>.Create;
   lUnitOfWork.RegisterDelete(CurrentList);
-  lPKType := NewList[i].GetPrimaryKeyFieldType;
-  for i := 0 to NewList.Count - 1 do
+  if NewList.Count > 0 then
   begin
-    if NewList[i].PKIsNull then
+    lPKType := NewList[0].GetPrimaryKeyFieldType;
+    for i := 0 to NewList.Count - 1 do
     begin
-      lUnitOfWork.RegisterInsert(NewList[i]);
-      continue;
-    end;
+      if NewList[i].PKIsNull then
+      begin
+        lUnitOfWork.RegisterInsert(NewList[i]);
+        continue;
+      end;
 
-    case lPKType of
-      ftString:
-        begin
-          lNeedsToBeUpdated := TMVCUnitOfWork<T>.KeyExistsString(CurrentList,
-            NewList[i].GetPK.AsString, lFoundAtIndex);
-        end;
-      ftInteger:
-        begin
-          lNeedsToBeUpdated := TMVCUnitOfWork<T>.KeyExistsInt(CurrentList,
-            NewList[i].GetPK.AsInteger, lFoundAtIndex);
-        end;
-      ftLargeInt:
-        begin
-          lNeedsToBeUpdated := TMVCUnitOfWork<T>.KeyExistsInt64(CurrentList,
-            NewList[i].GetPK.AsInt64, lFoundAtIndex);
-        end;
-    else
-      raise EMVCActiveRecord.Create('Invalid primary key type');
-    end;
+      case lPKType of
+        ftString:
+          begin
+            lNeedsToBeUpdated := TMVCUnitOfWork<T>.KeyExistsString(CurrentList,
+              NewList[i].GetPK.AsString, lFoundAtIndex);
+          end;
+        ftInteger:
+          begin
+            lNeedsToBeUpdated := TMVCUnitOfWork<T>.KeyExistsInt(CurrentList,
+              NewList[i].GetPK.AsInteger, lFoundAtIndex);
+          end;
+        ftLargeInt:
+          begin
+            lNeedsToBeUpdated := TMVCUnitOfWork<T>.KeyExistsInt64(CurrentList,
+              NewList[i].GetPK.AsInt64, lFoundAtIndex);
+          end;
+      else
+        raise EMVCActiveRecord.Create('Invalid primary key type');
+      end;
 
-    if lNeedsToBeUpdated then
-      lUnitOfWork.RegisterUpdate(NewList[i])
-    else
-      lUnitOfWork.RegisterInsert(NewList[i]);
+      if lNeedsToBeUpdated then
+        lUnitOfWork.RegisterUpdate(NewList[i])
+      else
+        lUnitOfWork.RegisterInsert(NewList[i]);
+    end;
   end;
   Result := lUnitOfWork as IMVCMultiExecutor<T>;
 end;
@@ -3148,7 +3151,7 @@ end;
 
 procedure TMVCUnitOfWork<T>.Apply(const ItemApplyAction: TMVCItemApplyAction<T>);
 var
-  i: UInt32;
+  i: Integer;
   lHandled: Boolean;
 begin
   for i := 0 to fListToInsert.Count - 1 do
@@ -3166,7 +3169,7 @@ begin
     DoItemApplyAction(fListToUpdate[i], eaUpdate, ItemApplyAction, lHandled);
     if not lHandled then
     begin
-      fListToUpdate[i].Update;
+      fListToUpdate[i].Update(True);
     end;
   end;
   for i := 0 to fListToDelete.Count - 1 do
@@ -3175,7 +3178,7 @@ begin
     DoItemApplyAction(fListToDelete[i], eaDelete, ItemApplyAction, lHandled);
     if not lHandled then
     begin
-      fListToDelete[i].Delete;
+      fListToDelete[i].Delete(True);
     end;
   end;
 end;
@@ -3246,7 +3249,7 @@ begin
   Result := false;
   for i := 0 to NewList.Count - 1 do
   begin
-    if NewList[i].GetPK.AsInt64 = KeyValue then
+    if (not NewList[i].PKIsNull) and (NewList[i].GetPK.AsInt64 = KeyValue) then
     begin
       Index := i;
       Exit(True);
diff --git a/sources/MVCFramework.Middleware.Compression.pas b/sources/MVCFramework.Middleware.Compression.pas
index 6ea50258..6d94c21d 100644
--- a/sources/MVCFramework.Middleware.Compression.pas
+++ b/sources/MVCFramework.Middleware.Compression.pas
@@ -80,9 +80,9 @@ var
   lItem: string;
   lRespCompressionType: TMVCCompressionType;
   lTmpItem: string;
-{$IF not Defined(ALEXANDRIAORBETTER)}
+{.$IF not Defined(ALEXANDRIAORBETTER)}
   lZStream: TZCompressionStream;
-{$ENDIF}
+{.$ENDIF}
 begin
   if IsLibrary then
   begin
@@ -107,16 +107,16 @@ begin
     lTmpItem := lItem.Trim;
     if lTmpItem = 'gzip' then
     begin
-{$IF Defined(ALEXANDRIAORBETTER)}
+{.$IF Defined(ALEXANDRIAORBETTER)}
       {
         There is a bug in 11 Alexandria with TZCompressionStream, so the gzip compression
         is not available until the fix.
         The issue has been created on https://quality.embarcadero.com/browse/RSP-35516
       }
-{$ELSE}
+{.$ELSE}
       lRespCompressionType := TMVCCompressionType.ctGZIP;
       break;
-{$ENDIF}
+{.$ENDIF}
     end
     else if lTmpItem = 'deflate' then
     begin
@@ -133,21 +133,31 @@ begin
   // begin
   lMemStream := TMemoryStream.Create;
   try
-{$IF Defined(ALEXANDRIAORBETTER)}
-    ZCompressStream(lContentStream, lMemStream);
+{.$IF Defined(ALEXANDRIAORBETTER)}
+    //ZCompressStream(lContentStream, lMemStream);
     // use it only for deflate, ZCompressStream (Delphi 11.0) cannot
     // create gzip compliant streams
-{$ELSE}
+{.$ELSE}
     lZStream := TZCompressionStream.Create(lMemStream,
       TZCompressionLevel.zcDefault, MVC_COMPRESSION_ZLIB_WINDOW_BITS
       [lRespCompressionType]);
     try
       lContentStream.Position := 0;
-      lZStream.CopyFrom(lContentStream, 0)
+// WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
+// WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
+// WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
+//    There is a bug in 11 Alexandria with TZCompressionStream, this bug
+//    raises an exception here and the debugger catches it, but it its "normal" behavior.
+//    The gzip stream is correctly created. Please, vote for its resolution.
+//    https://quality.embarcadero.com/browse/RSP-35516
+// WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
+// WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
+// WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
+      lZStream.CopyFrom(lContentStream, 0);
     finally
       lZStream.Free;
     end;
-{$ENDIF}
+{.$ENDIF}
   except
     lMemStream.Free;
     raise;
diff --git a/sources/MVCFramework.pas b/sources/MVCFramework.pas
index 5d99ae6e..963d2a2f 100644
--- a/sources/MVCFramework.pas
+++ b/sources/MVCFramework.pas
@@ -319,6 +319,8 @@ type
   public
     constructor Create(const AParamName: string); overload;
     constructor Create(const AParamName: string; const DefaultAsString: string); overload;
+    constructor Create(const AParamName: string; const DefaultAsInteger: Int64); overload;
+    constructor Create(const AParamName: string; const DefaultAsBoolean: Boolean); overload;
     property ParamName: string read FParamName;
     property DefaultValueAsString: string read FDefaultValueAsString;
     property CanBeUsedADefaultValue: Boolean read FCanBeUsedADefaultValue;
@@ -525,8 +527,8 @@ type
     FIsSessionStarted: Boolean;
     FSessionMustBeClose: Boolean;
     FLoggedUser: TUser;
-    FData: TDictionary<string, string>;
     FWebSession: TWebSession;
+    FData: TMVCStringDictionary;
     function GetWebSession: TWebSession;
     function GetLoggedUser: TUser;
     function GetParamsTable: TMVCRequestParamsTable;
@@ -538,6 +540,7 @@ type
     function SendSessionCookie(const AContext: TWebContext): string;
     function AddSessionToTheSessionList(const ASessionType, ASessionId: string;
       const ASessionTimeout: Integer): TWebSession;
+    function GetData: TMVCStringDictionary;
   public
     constructor Create(const ARequest: TWebRequest; const AResponse: TWebResponse;
       const AConfig: TMVCConfig; const ASerializers: TDictionary<string, IMVCSerializer>);
@@ -557,7 +560,7 @@ type
     property Response: TMVCWebResponse read FResponse;
     property Session: TWebSession read GetWebSession;
     property Config: TMVCConfig read FConfig;
-    property Data: TDictionary<string, string> read FData;
+    property Data: TMVCStringDictionary read GetData;
     property ParamsTable: TMVCRequestParamsTable read GetParamsTable write SetParamsTable;
   end;
 
@@ -1151,6 +1154,18 @@ begin
   FCanBeUsedADefaultValue := False;
 end;
 
+constructor MVCInjectableParamAttribute.Create(const AParamName: string;
+  const DefaultAsInteger: Int64);
+begin
+  Create(AParamName, DefaultAsInteger.ToString);
+end;
+
+constructor MVCInjectableParamAttribute.Create(const AParamName: string;
+  const DefaultAsBoolean: Boolean);
+begin
+  Create(AParamName, iif(DefaultAsBoolean,'true','false'));
+end;
+
 { MVCProducesAttribute }
 
 constructor MVCProducesAttribute.Create(const AValue, ACharset: string);
@@ -1918,7 +1933,7 @@ begin
   FResponse := TMVCWebResponse.Create(AResponse);
   FConfig := AConfig;
   FSerializers := ASerializers;
-  FData := TDictionary<string, string>.Create;
+  FData := nil;
   FLoggedUser := nil;
 end;
 
@@ -1949,6 +1964,15 @@ begin
   FResponse.Flush;
 end;
 
+function TWebContext.GetData: TMVCStringDictionary;
+begin
+  if fData = nil then
+  begin
+    fData := TMVCStringDictionary.Create;
+  end;
+  Result := fData;
+end;
+
 function TWebContext.GetHostingFrameworkType: TMVCHostingFrameworkType;
 begin
 {$IFDEF WEBAPACHEHTTP}