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I thougt it was a bug because when calling close() handlers are removed
from some data structure (the global dictionary and the global list) but
they're left inside the loggers they're attached to. Now I understand
that this is a responsibility of who attached the handler; probably my
patch would break or just behave differently with code that already
managed to remove logging handlers from loggers explicitly or that
relied on the fact that even a "closed" handler can still be notified.
Having the logging module to work correctly in IDLE and other
environments that keep a running instance of the interpreter provided
that shutdown is called would have been just a lucky nice side effect of
"fixing" handler.close (of course those IDEs will still have potential
problems with any module that keeps an internal state).