RFC: Immediately return true for equality checks if is(A,B)

Perhaps I'm missing something but why not immediately return true from these checks if the two objects are identical?  If this is valid there are likely other places this could happen too...but I thought I would first check.

Thanks,

Glen
Merge pull request #4654 from GlenHertz/patch-5

RFC: Immediately return true for equality checks if is(A,B)