https://issues.dlang.org/show_bug.cgi?id=18541
--- Comment #8 from Steven Schveighoffer <schvei...@yahoo.com> --- Yeah, there is no inlining of it. There is a bit of magic in the compiler for Object == Object, and I think that magic is stopping the inlining. Of course, the compiler magic could be made to simply do the `is` comparison first, and then call the object function (we can take `lhs is rhs` out of the function itself). I think this would be a worthy enhancement request, especially considering the performance benefits. I'm not sure how keen someone is to delve into updating that code, it's kind of a mess. --
