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This is an experiment to use type inference & "holders" to change the extract_argument code to no longer need to take &mut holder inputs to argument extraction but instead produce holders as outputs from extraction. The holders then have a subsequent "unpack" phase.

I think this might enable error messages for unimplemented PyFunctionArgument to look a bit nicer, I'm going to play with that shortly. Pushing now to see what the pipeline thinks.

Will update this PR with a more detailed description as the code takes shape...

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codspeed-hq bot commented Jan 19, 2026

CodSpeed Performance Report

Merging this PR will not alter performance

Comparing davidhewitt:extract-rework (07e9db8) with main (c4c5b1e)

Summary

✅ 100 untouched benchmarks

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