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feat: add `fletcher32` codec (#123) #888

Job	Run time
clippy	1m 2s
build_and_test_windows	5m 35s
build_and_test (stable, --features "")	2m 4s
build_and_test_macos (macos-13)	2m 57s
build_and_test (stable, --all-features)	2m 49s
build_and_test_macos (macos-latest)	2m 1s
build_and_test (stable, --no-default-features)	2m 2s
fmt	33s
build_and_test (1.77, --features "")	2m 26s
codecov	1m 57s
minimal-versions	2m 0s
build_and_test (1.77, --all-features)	2m 52s
semver	1m 42s
build_and_test (1.77, --no-default-features)	2m 16s
build_and_test (beta, --features "")	2m 12s
build_and_test (beta, --all-features)	2m 46s
build_and_test (beta, --no-default-features)	1m 51s
build_and_test (nightly, --features "")	1m 45s
build_and_test (nightly, --all-features)	1m 51s
build_and_test (nightly, --no-default-features)	2m 5s
	44m 46s

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