Feature request: AVar.take that can update and return a value

[maurges]

Like MVar.modifyMVar:
modifyAVar :: AVar a -> (a -> Effect (Tuple a b)) -> Effect b

[maurges]

Looking through the library again, the Effect part leaves out a lot of synchronization functions, i'm starting to think it was on purpose

[natefaubion]

modify variations are a purposeful omission. I consider them a footgun, because on the surface one would assume they are atomic, but really anyone can put to an AVar at any given time. I think it's something that belongs in a higher-level API than AVar for locked resources.