anchor.diff:  
   function TThreadHeap.ReallocMediumToMedium(P: Pointer;
     NewB16Count: NativeUInt): Pointer;
  -begin
  -  // todo
  -  Result := PenaltyReallocMediumToMedium(P, NewB16Count);
  +var
  +  Header: PHeaderMedium;
  +  Flags, EmptyFlags: NativeUInt;
  +begin
  +  // header flags
  +  Header := P;
  +  Flags := PHeaderMedium(NativeInt(P) - SizeOf(THeaderMedium)).Flags;
  +
  +  // if (Next.Empty) then try Reduce (Next)
  +  EmptyFlags := Flags and MASK_MEDIUM_ALLOCATED_TEST;
  +  Flags := Word(Flags);
  +  if (EmptyFlags = MASK_MEDIUM_ALLOCATED_VALUE) then
  +  begin
  +    Dec(NewB16Count{GrowCount}, Flags);
  +    Flags := Flags shl 4;
  +    Inc(NativeUInt(Header), Flags);
  +    EmptyFlags := Header.Flags;
  +    if (EmptyFlags and MASK_MEDIUM_EMPTY_TEST = MASK_MEDIUM_EMPTY_VALUE) and
  +      (Header.PreviousSize = Flags) then
  +    begin
  +      Inc(NewB16Count, 2);
  +      if (EmptyFlags >= NewB16Count{ + 2}) then
  +      begin
  +        Dec(NewB16Count, 2);
  +        EmptyFlags := EmptyFlags shl 4;
  +        NewB16Count := NewB16Count shl 4;
  +        Inc(NativeUInt(Header), EmptyFlags);
  +
  +        Dec(EmptyFlags, NewB16Count);
  +        Inc(NewB16Count, Flags);
  +        PHeaderMediumEmptyEx(Header{Empty}).Size := EmptyFlags;
  +
  +        Dec(NativeUInt(Header), EmptyFlags);
  +        EmptyFlags := EmptyFlags shr 4;
  +        Header.Flags := EmptyFlags;
  +        Header.PreviousSize := NewB16Count;
  +
  +        // result
  +        Dec(Header);
  +        Dec(NativeUInt(Header), NewB16Count);
  +        NewB16Count := NewB16Count shr 4;
  +        Header.B16Count := NewB16Count;
  +        Result := Pointer(@PHeaderMediumList(Header)[0]);
  +        Exit;
  +      end;
  +      Dec(NewB16Count, 2);
  +    end;
  +
  +    Dec(NativeUInt(Header), Flags);
  +    Flags := Flags shr 4;
  +    Inc(NewB16Count, Flags);
  +  end;
  +
  +  Result := PK64PoolMedium(NativeInt(Header) and MASK_K64_CLEAR).ThreadHeap.PenaltyReallocMediumToMedium(Pointer(Header), NewB16Count);
   end;
   
   function TThreadHeap.PenaltyReallocMediumToMedium(P: Pointer;
  
positive.code:   Header: PHeaderMedium;
    Flags, EmptyFlags: NativeUInt;
    Pool: PK64PoolMedium;
  
    StoreHeader:  PHeaderMedium;
  begin
    // header flags
    Header := P;
  
negative.code: 
  function TThreadHeap.RegetMediumToMedium(P: Pointer;
    NewB16Count: NativeUInt): Pointer;
  var
    Header: PHeaderMedium;
    Flags, EmptyFlags: NativeUInt;
  begin
    // header flags
    Header := P;
    Flags := PHeaderMedium(NativeInt(P) - SizeOf(THeaderMedium)).Flags;
  
    // if (Next.Empty) then try Reduce (Next)
    EmptyFlags := Flags and MASK_MEDIUM_ALLOCATED_TEST;
    Flags := Word(Flags);
    if (EmptyFlags = MASK_MEDIUM_ALLOCATED_VALUE) then
    begin
      Dec(NewB16Count{GrowCount}, Flags);
      Flags := Flags shl 4;
      Inc(NativeUInt(Header), Flags);
      EmptyFlags := Header.Flags;
      if (EmptyFlags and MASK_MEDIUM_EMPTY_TEST = MASK_MEDIUM_EMPTY_VALUE) and
        (Header.PreviousSize = Flags) then
      begin
        Inc(NewB16Count, 2);
        if (EmptyFlags >= NewB16Count{ + 2}) then
        begin
          Dec(NewB16Count, 2);
          EmptyFlags := EmptyFlags shl 4;
          NewB16Count := NewB16Count shl 4;
          Inc(NativeUInt(Header), EmptyFlags);
  
          Dec(EmptyFlags, NewB16Count);
          Inc(NewB16Count, Flags);
          PHeaderMediumEmptyEx(Header{Empty}).Size := EmptyFlags;
  
          Dec(NativeUInt(Header), EmptyFlags);
          EmptyFlags := EmptyFlags shr 4;
          Header.Flags := EmptyFlags;
          Header.PreviousSize := NewB16Count;
  
          // result
          Dec(Header);
          Dec(NativeUInt(Header), NewB16Count);
          NewB16Count := NewB16Count shr 4;
          Header.B16Count := NewB16Count;
          Result := Pointer(@PHeaderMediumList(Header)[0]);
          Exit;
        end;
        Dec(NewB16Count, 2);
      end;
  
      Dec(NativeUInt(Header), Flags);
      Flags := Flags shr 4;
      Inc(NewB16Count, Flags);
    end;
  
    Result := PK64PoolMedium(NativeInt(Header) and MASK_K64_CLEAR).ThreadHeap.PenaltyRegetMediumToMedium(Pointer(Header), NewB16Count);
  end;
  
  function TThreadHeap.PenaltyRegetMediumToMedium(P: Pointer;
  