`ipaddress`: `subnet_of()` and `supernet_of()` raise confusing `TypeError` wrapping an `AttributeError` when passed an Address object

Bug report

Bug description:

When calling subnet_of() or supernet_of() on an IPv4Network or IPv6Network and passing an address object (e.g., IPv6Address) instead of a network object, the module attempts to access the network_address attribute on the address object. This raises an AttributeError, which is then caught by the broader exception handling in _is_subnet_of, resulting in a confusing TypeError that completely masks the original attribute access failure.

The method should explicitly check that the other argument is a network object (or at least raise a clear TypeError stating that a network object is required) rather than failing internally with an AttributeError that gets swallowed into a generic containment error.

Repro:

import ipaddress
ipaddress.IPv6Network('::/0').subnet_of(ipaddress.IPv6Address('::1'))

Traceback:

AttributeError: 'IPv6Address' object has no attribute 'network_address'

During handling of the above exception, another exception occurred:

TypeError: Unable to test subnet containment between ::/0 and ::1

ipaddress_repro.py

CPython versions tested on:

3.14

Operating systems tested on:

macOS

Linked PRs

• gh-154147

Start in the Python ipaddress module at _is_subnet_of, which handles subnet_of() and supernet_of(), and reproduce the reported call with an IPv6Address. Confirm that passing an address produces a clear TypeError stating that a network object is required rather than the wrapped containment error.