gh-143886: Ensure function annotations are returned in order of definition#143888
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JelleZijlstra merged 1 commit intopython:mainfrom Apr 15, 2026
Merged
gh-143886: Ensure function annotations are returned in order of definition#143888JelleZijlstra merged 1 commit intopython:mainfrom
JelleZijlstra merged 1 commit intopython:mainfrom
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pR0Ps
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JelleZijlstra,
iritkatriel,
markshannon and
rhettinger
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Previously, when getting type annotations of a function, normal arguments were returned before positional-only ones in the dictionary. Since `functools.singledispatch` relies on this ordering being correct to dispatch based on the type of the first argument, this issue was causing incorrect registrations for functions with positional-only arguments. This commit updates how annotations are generated so that positional-only arguments are generated and added to the dictionary before normal arguments.
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Previously, when getting type annotations of a function, normal arguments were returned before positional-only ones in the dictionary. Since
functools.singledispatchrelies on this ordering being correct to dispatch based on the type of the first argument, this issue was causing incorrect registrations for functions with positional-only arguments.This PR updates how annotations are generated so that positional-only arguments are generated and added to the dictionary before normal arguments.