booyah/FontLabel — comment on commit c3d914517a8687ddf59763c6a322cb58d3b4ece0
File: FontLabel/Classes/FontLabel/FontLabelStringDrawing.h line 43
By kballard:

Globals are a bad idea. They turn a stateless API into a stateful one, and they break thread safety. I don't know if FontLabel is truly thread-safe right now, but globals would explicitly break that.