[issue18805] ipaddress netmask/hostmask parsing bugs

[Nick Coghlan]

Nick Coghlan added the comment:

OK, what I have done is translated the new *tests* from the upstream patch to the standard library tests, and then used the upstream functional patch as a guide for fixing the standard library version.

I'll upload the final patch here, but I won't wait for review before committing it (I'd like to ensure it makes the 3.4rc1 tag tomorrow).

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