[issue23103] Reduce memory usage for ipaddress object instances

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

As far as adding __slots__ breaks pickling with protocols < 2, issue23133 can be considered as a dependency.

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dependencies: +Pickling of ipaddress classes

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23103>
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