Incorrect ipaddress.reverse_pointer with improved textual representation of IPv4-mapped IPv6 addresses

[kellyjonbrazil]

I'm seeing strange results with python 3.13 with the ipaddress.reverse_pointer method with the new improved textual representation of IPv4-mapped IPv6 addresses:

IP Address: ::FFFF:192.168.1.35

Results in a reverse_pointer of:

5.3...1...8.6.1...2.9.1.f.f.f.f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa

instead of the old:

3.2.1.0.8.a.0.c.f.f.f.f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa

I'm not sure which one is more valid or if a pointer record is even relevant in the context of mapped addresses. The original way seems more correct to me if nothing for the fact that there are strange extra dots in the new output.

This is related to:

Issue: #87799

PR: #29345

Originally posted by @kellyjonbrazil in #87799 (comment)

[kellyjonbrazil]

Closing and creating a new bug report: #123409