Bug report

Bug description:

The following properties on an IPv6Address don't match their IPv4Address counterparts when using an IPv6-mapped IPv4 address (ie ::ffff:<ipv4>):

• is_multicast
• is_reserved
• is_link_local
• is_global
• is_unspecified

Proposed fix is to make all properties use their IPv4Address values for IPv4-mapped addresses.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-122792: Make IPv4-mapped IPv6 address properties consistent with IPv4 #122793
• [3.12] gh-122792: Make IPv4-mapped IPv6 address properties consistent with IPv4 (GH-122793) #123814
• [3.13] gh-122792: Make IPv4-mapped IPv6 address properties consistent with IPv4 (GH-122793) #123815
• [3.11] gh-122792: Make IPv4-mapped IPv6 address properties consistent with IPv4 (GH-122793) #123818
• [3.10] gh-122792: Make IPv4-mapped IPv6 address properties consistent with IPv4 (GH-122793) #123819
• [3.9] gh-122792: Make IPv4-mapped IPv6 address properties consistent with IPv4 (GH-122793) (GH-123819) #127571