Add BytesPerBlock helper #138

Job	Run time
build (windows-2019, x64-Debug, amd64)	1m 23s
build (windows-2019, x64-Release, amd64)	2m 23s
build (windows-2022, x64-Debug, amd64)	2m 9s
build (windows-2022, x64-Release, amd64)	2m 28s
build (windows-2019, x86-Debug, amd64_x86)	2m 6s
build (windows-2019, x86-Release, amd64_x86)	2m 39s
build (windows-2022, x86-Debug, amd64_x86)	1m 24s
build (windows-2022, x86-Release, amd64_x86)	3m 17s
build (windows-2022, x64-Debug-Clang, amd64)	1m 31s
build (windows-2022, x64-Release-Clang, amd64)	3m 8s
build (windows-2022, x86-Debug-Clang, amd64_x86)	2m 37s
build (windows-2022, x86-Release-Clang, amd64_x86)	2m 51s
build (windows-2022, arm64-Debug, amd64_arm64)	1m 35s
build (windows-2022, arm64-Release, amd64_arm64)	1m 33s
build (windows-2022, arm64ec-Debug, amd64_arm64)	1m 55s
build (windows-2022, arm64ec-Release, amd64_arm64)	1m 31s
	34m 30s

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