[issue21486] optimize v4 & v6 netmask parsing

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2158614e1607 by Antoine Pitrou in branch 'default':
Issue #21486: Optimize parsing of netmasks in ipaddress.IPv4Network and ipaddress.IPv6Network.
http://hg.python.org/cpython/rev/2158614e1607

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nosy: +python-dev

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<http://bugs.python.org/issue21486>
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