Add IO-free variants of some functions #21

Job	Run time
i386	9m 27s
arm (arm32v7)	10m 6s
arm (arm64v8)	8m 54s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	35m 26s
build (ubuntu-latest, 8.6, 3.8.1.0)	21m 17s
darwin_arm (self-hosted, macOS, ARM64, 9.2.8)	22m 47s
build (ubuntu-latest, 8.8, 3.8.1.0)	10m 1s
build (ubuntu-latest, 8.10, 3.8.1.0)	11m 10s
darwin_arm (self-hosted, macOS, ARM64, 9.4.7)	25m 10s
build (ubuntu-latest, 9.0, 3.8.1.0)	10m 46s
build (ubuntu-latest, 9.2, 3.8.1.0)	9m 41s
build (ubuntu-latest, 9.4, 3.8.1.0)	10m 29s
build (ubuntu-latest, 9.6, 3.8.1.0)	10m 44s
build (ubuntu-latest, 9.8, 3.8.1.0)	8m 0s
build (macOS-latest, 9.4, 3.8.1.0)	47m 24s
build (macOS-latest, 9.6, 3.8.1.0)	35m 0s
build (windows-latest, 9.4, 3.8.1.0)	51m 54s
build (windows-latest, 9.6, 3.8.1.0)	52m 34s
	6h 30m 50s

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