Compute values for rational magnitude powers #128

Job	Run time
std::format none C++20 Clang-18 Release	1m 39s
std::format none C++20 Clang-18 Debug	4m 31s
std::format none C++23 Clang-18 Release	2m 35s
std::format none C++23 Clang-18 Debug	4m 30s
std::format gsl-lite C++20 Clang-18 Release	2m 50s
std::format gsl-lite C++20 Clang-18 Debug	5m 14s
std::format gsl-lite C++23 Clang-18 Release	2m 38s
std::format gsl-lite C++23 Clang-18 Debug	4m 16s
std::format ms-gsl C++20 Clang-18 Release	2m 48s
std::format ms-gsl C++20 Clang-18 Debug	4m 33s
std::format ms-gsl C++23 Clang-18 Release	2m 44s
std::format ms-gsl C++23 Clang-18 Debug	4m 27s
fmtlib none C++20 Clang-18 Release	6m 45s
fmtlib none C++20 Clang-18 Debug	6m 14s
fmtlib none C++23 Clang-18 Release	6m 22s
fmtlib none C++23 Clang-18 Debug	6m 2s
fmtlib gsl-lite C++20 Clang-18 Release	6m 36s
fmtlib gsl-lite C++20 Clang-18 Debug	6m 30s
fmtlib gsl-lite C++23 Clang-18 Release	6m 41s
fmtlib gsl-lite C++23 Clang-18 Debug	6m 8s
fmtlib ms-gsl C++20 Clang-18 Release	6m 33s
fmtlib ms-gsl C++20 Clang-18 Debug	6m 29s
fmtlib ms-gsl C++23 Clang-18 Release	6m 53s
fmtlib ms-gsl C++23 Clang-18 Debug	6m 9s
	2h 0m 7s

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