Serhiy Storchaka added the comment:
Only one duplicated address is degenerated case. When there is a lot of
duplicated addresses in range the patch causes regression.
$ ./python -m timeit -s "import ipaddress; ips =
[ipaddress.ip_address('2001:db8::%x' % (i%100)) for i in range(100000)]" --
"ipaddress.collapse_addresses(ips)"
Unpatched: 10 loops, best of 3: 369 msec per loop
Patched: 10 loops, best of 3: 1.04 sec per loop
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<http://bugs.python.org/issue23266>
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