Guido van Rossum added the comment: Thanks, but I don't like the idea of that patch. It feels like a hack that makes it less likely that the issue occurs, but I don't feel we should rely on the callbacks being called before checking the selector again. There may be other reasons (perhaps a future modification to the code) why we might occasionally check the selector redundantly. IOW I think we should really ensure that all I/O callbacks are properly idempotent.
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