PVS-Studio warning V801 for UnrealEngine4

class FVariant
{
  ....
  FVariant& operator=( const TArray<uint8> InArray )
  {
    Type = EVariantTypes::ByteArray;
    Value = InArray;

    return *this;
  }
  ....
}

This suspicious code was found in UnrealEngine4 project by PVS-Studio static code analyzer.
Warning message is:
V801 Decreased performance. It is better to redefine the first function argument as a reference. Consider replacing 'const .. InArray' with 'const .. &InArray'. variant.h 198

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/