fix: restore static typing of inject.attr(Cls)

[trin94]

Hi, I recently opened issue #135 to report the static typing regression. Today, I looked into this myself using AI (Claude Opus 4.8).

The actual fix is tiny:

before:

@t.overload
def attr(cls: t.Hashable) -> Injectable: ...


@t.overload
def attr(cls: type[T]) -> T: ...

after:

@t.overload
def attr(cls: type[T]) -> T: ...


@t.overload
def attr(cls: t.Hashable) -> Injectable: ...

Verified locally via `uvx --with tox-uv tox -e lint-types`

python-inject on  fix-attr-overload-order [?] via 🐍 v3.10.0 (python-inject) 
❯ uvx --with tox-uv tox -e lint-types
.pkg: _optional_hooks> python /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/lib/python3.10/site-packages/pyproject_api/_backend.py True hatchling.build
.pkg: get_requires_for_build_editable> python /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/lib/python3.10/site-packages/pyproject_api/_backend.py True hatchling.build
.pkg: build_editable> python /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/lib/python3.10/site-packages/pyproject_api/_backend.py True hatchling.build
lint-types: install_package> /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/bin/uv pip install --reinstall --no-deps inject@/home/elias/PycharmProjects/python-inject/.tox/.tmp/package/24/inject-5.4.1.dev2+ge54ad9e6b.d20260626-py3-none-any.whl
lint-types: commands[0]> mypy typing_checks
typing_checks/attr.py:16: error: Expression is of type "object | Any", not "_Service"  [assert-type]
typing_checks/attr.py:17: error: Expression is of type "object | Any", not "_Repository"  [assert-type]
Found 2 errors in 1 file (checked 2 source files)
lint-types: exit 1 (0.10 seconds) /home/elias/PycharmProjects/python-inject> mypy typing_checks pid=39578
.pkg: _exit> python /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/lib/python3.10/site-packages/pyproject_api/_backend.py True hatchling.build
  lint-types: FAIL code 1 (0.30=setup[0.20]+cmd[0.10] seconds)
  evaluation failed :( (0.34 seconds)

python-inject on  fix-attr-overload-order [!?] via 🐍 v3.10.0 (python-inject) 
❯ uvx --with tox-uv tox -e lint-types
.pkg: _optional_hooks> python /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/lib/python3.10/site-packages/pyproject_api/_backend.py True hatchling.build
.pkg: get_requires_for_build_editable> python /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/lib/python3.10/site-packages/pyproject_api/_backend.py True hatchling.build
.pkg: build_editable> python /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/lib/python3.10/site-packages/pyproject_api/_backend.py True hatchling.build
lint-types: install_package> /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/bin/uv pip install --reinstall --no-deps inject@/home/elias/PycharmProjects/python-inject/.tox/.tmp/package/25/inject-5.4.1.dev2+ge54ad9e6b-py3-none-any.whl
lint-types: commands[0]> mypy typing_checks
Success: no issues found in 2 source files
.pkg: _exit> python /home/elias/.cache/uv/archive-v0/x3Z---987shE3V0B/lib/python3.10/site-packages/pyproject_api/_backend.py True hatchling.build
  lint-types: OK (0.30=setup[0.19]+cmd[0.11] seconds)
  congratulations :) (0.34 seconds)

We've basically swapping the order so that the typed one matches first.

The rest of the PR is adding a test + wiring it into the tox setup. I created a separate job as
tox -e lint-py (Lint formatting) is failing and the new public API type checks would never run.

Best

Fixes #135

[ivankorobkov]

Cool, thank you for the fix. I will make the next release now.

[ivankorobkov]

Done https://pypi.org/project/inject/5.4.1/