Josh Rosenberg added the comment: Minor correction: No allocation when small stack used, so you'd only see (possibly) regressions with 6+ keyword arguments (assuming the tuple free list applies for tuples that large). Admittedly a minor concern; keyword processing is already pretty slow, and large numbers of keywords being passed are likely a tiny fraction of call cases, so I'd guess microbenchmarks wouldn't show a big change, and broad benchmarks would be completely unaffected, but worth checking.
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