fix varnames on py3.14 deferred annotations #632
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In Python 3.14+, annotations are evaluated lazily per PEP 649/749. When inspect.signature() is called, it tries to resolve annotations by default, which fails if the annotation references an undefined type. Add a version-gated _signature helper that uses annotation_format=annotationlib.Format.STRING on Python 3.14+ to prevent annotation resolution errors. Fixes pytest-dev#629 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Use code object attributes (co_varnames, co_argcount) and __defaults__ directly instead of inspect.signature(). This avoids annotation resolution entirely, which is simpler and more efficient. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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closes #629
using direct attributes instead of signature to avoid the extra objects