Fix InvalidInstruction on windows CPUs that do not support POPCNT - #27803
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InvalidInstruction abort on windows on systems using older CPUs
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InvalidInstruction abort on windows on systems using older CPUsInvalidInstruction on windows CPUs that do not support POPCNT
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August 17, 2026 06:57
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August 17, 2026 06:57
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Summary
Restore mimalloc v2 because v3.3.2 can crash on Windows CPUs that do not support
POPCNT.Fixes astral-sh/ruff-vscode#1148.