sparse histogram with cumulative counts with read-only strait #432

Job	Run time
clippy	31s
audit	11s
check-ubuntu-latest	25s
build-ubuntu-latest-release	51s
check-macos-latest	34s
build-ubuntu-latest-debug	40s
rustfmt	9s
check-windows-latest	2m 32s
build-macos-latest-release	59s
build-macos-latest-debug	58s
build-windows-latest-release	3m 3s
build-windows-latest-debug	4m 1s
clippy-upload	13s
verify all tests pass	1s
	15m 8s

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