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.
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Brief explanation of dangers?
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. Worried about composition wrt target queues, APIs which mutate queues, and resilience against future concurrent APIs.
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presumably, most of the time, intent is really "main queue or not". Flag to specify preferred?
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I don’t think they’re entirely academic; the potential to deadlock is dangerous.