Merge pull request #1228 from maspypy/category #31

Job	Run time
generate (ubuntu-24.04, g++-13) / generate	1m 29s
generate (macos-latest, clang++) / generate	51s
generate (ubuntu-latest, g++-12) / generate	1m 16s
generate (windows-latest, g++) / generate	2m 1s
	5m 37s

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