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I’m still not a fan of the API idiom of accepting a queue on which to run callbacks. There are dangers there… but maybe they’re academic.

so which queue should it run the callback on? Unspecified? Main? I personally prefer main if called from main, unsp. if not.

Unspecified. I can be swayed if the API specifically regards UI in some way.

I wish there was a very strongly defined rule in the frameworks. Mix & Match is worse than any of the choices.

Replying to

Agreed.