[issue21566] make use of the new default socket.listen() backlog argument

[Roundup Robot]

Roundup Robot added the comment:

New changeset f7643c893587 by Charles-François Natali in branch 'default':
Issue #21566: Make use of socket.listen() default backlog.
http://hg.python.org/cpython/rev/f7643c893587

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nosy: +python-dev

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