Artifact 3b43d510061a2f5ef2261ff35e76d948a7121fdd3c95470c4eeeacb64029854a:
This means refusing to close twice, calling -[close] from -[dealloc] and
not calling -[cancelAsyncRequests].
Calling -[cancelAsyncRequests] in -[close] is too dangerous, as -[close]
gets called by -[dealloc]: If the queue is the last reference to the
object, at the point where -[cancelAsyncRequests] removes it from the
queue, the object will start to deallocate and call into
-[cancelAsyncRequests] again, which is still in the middle of removing
it and now finds itself with an inconsistent state.
by
js on
2020-01-14 00:16:04.
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