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Paul Sokolovsky authored
Per CPython docs, "Registering a file descriptor that’s already registered is not an error, and has the same effect as registering the descriptor exactly once." https://docs.python.org/3/library/select.html#select.poll.register That's somewhat ambiguous, what's implemented here is that if fd si not yet registered, it is registered. Otherwise, the effect is equivalent to modify() method.
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