[issue21487] Assorted ipaddress performance improvements

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2711677cf874 by Antoine Pitrou in branch 'default':
Issue #21487: Optimize ipaddress.summarize_address_range() and ipaddress.{IPv4Network,IPv6Network}.subnets().
http://hg.python.org/cpython/rev/2711677cf874

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nosy: +python-dev

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<http://bugs.python.org/issue21487>
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