Codec partial encoders #678

Job	Run time
build_and_test_windows	1m 8s
clippy	1m 22s
build_and_test (stable, --features "")	1m 21s
build_and_test_macos (macos-13)	1m 10s
build_and_test_macos (macos-latest)	1m 15s
build_and_test (stable, --all-features)	1m 22s
codecov	1m 22s
build_and_test (stable, --no-default-features)	1m 22s
fmt	48s
build_and_test (1.76, --features "")	1m 13s
build_and_test (1.76, --all-features)	1m 23s
minimal-versions	41s
semver	1m 9s
build_and_test (1.76, --no-default-features)	1m 22s
build_and_test (beta, --features "")	1m 23s
build_and_test (beta, --all-features)	1m 24s
build_and_test (beta, --no-default-features)	1m 10s
build_and_test (nightly, --features "")	1m 22s
build_and_test (nightly, --all-features)	1m 21s
build_and_test (nightly, --no-default-features)	1m 22s
	25m 0s

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