Use type-level deprecations

[alex]

No description provided.

[mhils]

Much nicer, thanks! 🍰

LGTM % CI errors.

[alex]

Last challenge here: not compatible with python 3.7.

3.7 is currently about 10% of our downloads. OTOH, it's been unsupported by upstream for 18 months...

[mhils]

How about something like this?

if sys.version_info >= (3, 13):
    from warnings import deprecated
elif sys.version_info < (3, 8):
    def deprecated(msg, **_):
        return lambda f: f
else:
    from typing_extensions import deprecated

3.7 users won't get deprecation warnings then, but that probably is the least of their concerns...

[alex]

Hmm, it works, but it also makes it a regression on 3.7, since we currently warn... annoying...