Try pydantic-pint

[mattwthompson]

Description

Provide a brief description of the PR's purpose here.

Todos

Notable points that this PR has either accomplished or will accomplish.

• TODO 1

Questions

• Question1

Status

• Ready to go

[mattwthompson]

Unfortunately this would require a change in the toolkit under current construction:

$ pixi run -e py313pint25 python -m pytest downstream_dummy/tests/           pydantic-pint  ✭
=========================================== test session starts ===========================================
platform darwin -- Python 3.13.12, pytest-9.0.2, pluggy-1.6.0
Using --randomly-seed=4038091971
rootdir: /Users/mattthompson/software/openff-units
configfile: pyproject.toml
plugins: cov-7.1.0, xdist-3.8.0, randomly-3.15.0
collected 0 items / 1 error

================================================= ERRORS ==================================================
__________________________ ERROR collecting downstream_dummy/tests/test_dummy.py __________________________
downstream_dummy/tests/test_dummy.py:2: in <module>
    from dummy import object_to_quantity
downstream_dummy/dummy.py:113: in <module>
    @object_to_quantity.register(type[Quantity])
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.pixi/envs/py313pint25/lib/python3.13/functools.py:896: in register
    raise TypeError(
E   TypeError: Invalid first argument to `register()`: type[typing.Annotated[pint.registry.Quantity, <pydantic_pint.quantity.PydanticPintQuantity object at 0x10edebe00>]]. Use either `@register(some_class)` or plain `@register` on an annotated function.
========================================= short test summary info =========================================
ERROR downstream_dummy/tests/test_dummy.py - TypeError: Invalid first argument to `register()`: type[typing.Annotated[pint.registry.Quantity, <pyda...
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
============================================ 1 error in 0.23s =============================================