infectedsoundsystem/pyffi — comment on commit 378b34a146a74d88febf6f35225f2db71f696950
File: pyffi/spells/nif/optimize.py line 640
By amorilia:

The blocks are mutable, and therefore should not be hashable, although obviously apparently they are as this code works - I guess that's a bug. Anyway, the short story is that we can't use sets here unfortunately. The part of the patch which does not concern self.optimize looks ok.