Merge faster Riemann R function #71

Job	Run time
linux_gcc (ubuntu-latest, Debug)	4m 49s
linux_gcc (ubuntu-latest, Release)	2m 8s
linux_gcc_sanitizers	2m 23s
linux_clang (ubuntu-latest, Debug)	3m 32s
linux_clang (ubuntu-latest, Release)	1m 23s
linux_gcc_valgrind	1m 13s
macos_clang (macos-latest, Debug)	5m 3s
windows_mingw64 (windows-latest, Debug)	5m 12s
windows_msvc2022	2m 32s
windows_mingw64 (windows-latest, Release)	2m 46s
macos_clang (macos-latest, Release)	1m 9s
	32m 10s

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