[issue22941] IPv4Interface arithmetic changes subnet mask

[Søren Løvborg]

Søren Løvborg added the comment:

I take it the silence means that the patch is neither obviously good nor obviously bad. :-)

It all comes down to a judgment call: is this a bug, or expected (but undocumented) behavior?

In PEP 387 lingo: Is this a "reasonable bug fix"? Or is it a "design mistake", thus calling for a FutureWarning first, and the actual change later?

    >>> ipaddress.IPv4Interface('1.2.3.4/16') + 1
    __main__:1: FutureWarning: Arithmetic on IPv4Interface objects will
    change in Python 3.6. If you rely on the current behavior, change
    'interface + n' to 'IPv4Interface(interface.ip + n, 32)'

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