fix: injecting None into takes optional

[tlambert03]

fixes a bug where injecting into a function that takes an Thing | None but doesn't include a default of None raise an exception if the provider returns None

import in_n_out as ino

store = ino.Store(name="store")


class Thing: ...


@store.register_provider
def get_thing() -> Thing | None:
    return None


@store.inject
def use_thing(thing: Thing | None) -> None:
    print(f"got {thing=}")


use_thing()

[codspeed-hq]

CodSpeed Performance Report

Merging #106 will not alter performance

_{Comparing tlambert03:fix-optional (a24764d) with main (27a3f9e)}

Summary

✅ 5 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (78390f6) to head (a24764d).
Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #106   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          521       523    +2     
=========================================
+ Hits           521       523    +2     

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