severity: wishlist
tags: patch

Continuing from
https://lists.nongnu.org/archive/html/emacs-devel/2015-11/msg01437.html,
main code difference since then is that I use a subr instead of indexing
into a table of C functions (the reason for using an index was to avoid
GC on Ffuncall; instead I did that by checking if the function is SUBRP
and doing funcall_subr on it (a new function extracted from Ffuncall)).

I've also added tests, which turned up some interesting corner cases
regarding aliases, and also that I had completely missed
kill-local-variables.

I still need to write something up in the manual.