Fix compatibility issue with python <3.11

[ManiMozaffar]

There's no tests yet?
didn't know where to place them

fixes #42.

[ManiMozaffar]

a suggestion -> ui test would be definitely needed if you intend to write useful tests
https://github.com/microsoft/playwright-python
playwright by-far best framework I've used.

I'd be happy to give a hand

[samuelcolvin]

good spot, thanks. I think a simpler solution would be preferable as described above.

On playwright, maybe at some point we need e2e tests, but I'd rather postpone them as long as possible possible as they generally only act as a smoke test and slow down development significantly. Let's start with #18, python tests, and even some unit tests for the more complex bits of typescript code, and see how we get on.

[WolfDWyc]

This still isn't compatible, line 67 needs
def fill_fields(self) -> typing.Self: -> def fill_fields(self) -> typing_extensions.Self

I don't have permission to directly comment a line, so commenting here instead.

[WolfDWyc]

Also missing a typing_extensions import for Required in json_schema.py. I'll keep reporting.

[samuelcolvin]

Good points, thanks.

I'll add some basic tests to ci and fix all this stuff some time soon

[samuelcolvin]

great, thanks so much.