Handle lazily exposed class annotations in class-schema validation

[Copilot]

Class-based schemas could be misdetected as empty on Python 3.14, causing required annotated fields to be skipped instead of raising ValidationError. This primarily affected schemas defined only with annotations, e.g. name: str, age: int.

• Root cause

  • Class-schema detection and schema generation assumed __annotations__ always lived in cls.__dict__.
  • On newer Python behavior, annotations may be exposed lazily, so annotation-only schemas could bypass required-field validation.

• Implementation

  • Added a small helper to read class annotations from either:
    • the class __dict__, or
    • a lazily exposed __annotations__ attribute
  • Updated both:
    • class-schema detection (_is_class_schema)
    • class-to-schema conversion (_class_to_schema)
  • Preserved existing behavior around inherited annotations and non-schema classes.

• Regression coverage

  • Added a focused test that simulates lazily exposed annotations and verifies missing required fields still raise ValidationError.

class Profile:
    name: str
    age: int

validate({"name": "Alice"}, Profile)
# expected: ValidationError(path="age")

Warning

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