anchor.diff:    FDoubleValue:= TNullableDouble.Create();
     FStringValue:= TNullableString.Create();
     FIntegerValue:= TNullableInteger.Create();
  +  FUniqueValues:= TmStringDictionary.Create();
   end;
   
   destructor TmSummaryValue.Destroy;
  
positive.code:   FDoubleValue.Free;
    FStringValue.Free;
    FIntegerValue.Free;
    inherited Destroy;
  end;
  
  
negative.code: 
  uses
    Classes, contnrs, db,
    mVirtualDataSetInterfaces, mFloatsManagement, mNullables, mMaps;
  
  type
  
  