[Python-Dev] PEP 3144 review.

["Martin v. Löwis"]

>  - Masks are also 32- (128-) bit integers, which happen to have the
>    property that their leftmost N bits are all zero and the rest are all
>    one.

As a side note, I would be in favor of dropping the concept of a mask
from the library, and only support a prefix length.

IPv6 doesn't support masks at all, and even for IPv4, I think there are
conventions (if not RFCs) against using them in a way that does not
correspond to a prefix length.

Regards,
Martin