Fork request to STM?

[liamzee]

I'm working on what seems a very OOP library and I end up thinking of Objective. Notably, it's on MVar, is there any objection if I fork it (and possibly try to get it into Hackage) on STM instead of MVar? I know that STM means that unsafePerformIO is no longer usable, but it'd be interesting to modify your library to use STM instead.

[fumieval]

I'm fine with adding a STM variant to this package