typing: preserve functional decorator signatures - #335
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Use ParamSpec so return-value decorators keep wrapped callable arguments while refining return types for downstream type checkers.
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Preserve decorated callable signatures for functional return-value helpers.
What was wrong?
Return-value decorators refined return types but erased wrapped function argument signatures for type checkers.
Related to Issue #
Closes #
How was it fixed?
Updated the functional decorators to use
ParamSpec, preserving callable parameters while refining return types. Wrapper metadata is still preserved withfunctools.wraps, and mypy coverage verifies the improved inference.Todo:
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