[leandrodamascena]

Issue number: closes #8648

Summary

Changes

On Python 3.10, typing.get_type_hints wraps the annotation of a parameter whose default is None in Optional[...]. That hid the Annotated metadata, so Depends() was silently skipped and the parameter received None, and a request: Request = None parameter was not injected either. Python 3.11+ stopped wrapping, so only 3.10 was affected.

• New _unwrap_optional helper in depends.py returns the single non-None member of a Union/Optional, otherwise the annotation itself.
• Applied in _get_depends_from_annotation, in the Request injection inside solve_dependencies, and in _find_request_param_name.
• Three tests: Depends() with a None default, explicit Optional[Annotated[...]] and Annotated[...] | None, and request: Request = None. All three fail on 3.10 without the change and pass with it. tests/functional/event_handler and tests/unit/event_handler pass on 3.10 and 3.14.

User experience

Before, on Python 3.10:

@app.get("/my/path")
def handler(region: Annotated[str, Depends(get_region)] = None):
    return {"region": region}   # {"region": null}

After: {"region": "eu-west-1"}, the same as on 3.11+. No change for 3.11+ and no public API change.

Found while running the pre-release smoke test of develop in real Lambda functions on python3.10.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.93%. Comparing base (4fe0d6d) to head (cb2b574).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8649   +/-   ##
========================================
  Coverage    96.93%   96.93%           
========================================
  Files          318      318           
  Lines        16036    16045    +9     
  Branches      1423     1425    +2     
========================================
+ Hits         15545    15554    +9     
  Misses         349      349           
  Partials       142      142           

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