cargo

histogram: add subtract operation for sparse histograms (#115) #421

Job	Run time
audit	12s
build-ubuntu-latest-release	55s
check-ubuntu-latest	37s
build-ubuntu-latest-debug	35s
rustfmt	8s
check-macos-latest	31s
build-macos-latest-release	57s
clippy	45s
build-macos-latest-debug	48s
check-windows-latest	1m 42s
build-windows-latest-release	3m 31s
build-windows-latest-debug	2m 37s
clippy-upload	14s
verify all tests pass	1s
	13m 33s

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