Cheers for this, I'll have a butcher's
Quick update: This seems to still be a live issue: https://github.com/Modernizr/Modernizr/issues/1748
I'm going to play around with the proposition in the issue thread for a bit, but that seems like a rabbit hole I don't really want to go down.
Another update: I've tested the proposed change in the issue thread and it works for me in IE11, I expect Modernizr to be patched pretty soon.
Side note: Modernizr is a pretty nice code sample to read through.