Merge pull request #1110 from lpha-z/rational_approximation #220

Job	Run time
generate (macos-latest, clang++) / generate	1m 6s
generate (ubuntu-latest, g++-13) / generate	52s
generate (ubuntu-latest, g++-12) / generate	53s
generate (windows-latest, g++) / generate	2m 14s
	5m 5s

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