Better Globals.DefaultReplacements.
This speeds up DefaultReplacements by a lot (order of magnitude or so), speeding up my entire compilation by 1 ms=0.02%.
Also, this prevents it from hanging and/or slowly dying on -Fu$oops$ where environment variable oops contains “$oops$”.
On the other hand, this considerably changes the behaviour in the case of nested expansions, but probably won’t break anything. In particular, macros inside environment variables are now expanded too (can easily be prohibited, but why would you).
Edited by Rika