Merge pull request #1299 from maspypy/1296 #660

Job	Run time
generate (macos-latest, clang++) / generate	1m 5s
generate (windows-latest, g++) / generate	2m 22s
generate (ubuntu-24.04, g++-13) / generate	54s
generate (ubuntu-latest, g++-12) / generate	57s
	5m 18s

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