Signed/Unsigned Mismatch Inconsistency

So? Did you submit pull request? Because i don’t see problem with that and Epic staff will look on it and possibly discuss.

You also got 2nd option… submit bug raport ;p since you could consider this a bug + bug raport usally return email explaining why something is not a bug, but if it will pass as a bug it will be added to UE4 official bug tracker.