Rust

Improve calculate hashes #180

Job	Run time
linting	17s
build	24s
cross-testing (stable, ubuntu-latest, default)	12s
cross-testing (stable, ubuntu-latest, with-serde)	17s
cross-testing (stable, windows-latest, default)	1m 27s
cross-testing (stable, windows-latest, with-serde)	1m 27s
cross-testing (stable, macos-latest, default)	19s
cross-testing (stable, macos-latest, with-serde)	14s
cross-testing (nightly, ubuntu-latest, default)	27s
cross-testing (nightly, ubuntu-latest, with-serde)	19s
cross-testing (nightly, windows-latest, default)	1m 48s
cross-testing (nightly, windows-latest, with-serde)	2m 43s
cross-testing (nightly, macos-latest, default)	14s
cross-testing (nightly, macos-latest, with-serde)	14s
cross-testing (1.41, ubuntu-latest, default)	18s
cross-testing (1.41, ubuntu-latest, with-serde)	26s
cross-testing (1.41, windows-latest, default)	1m 31s
cross-testing (1.41, windows-latest, with-serde)	1m 48s
cross-testing (1.41, macos-latest, default)	13s
cross-testing (1.41, macos-latest, with-serde)	13s
	14m 51s

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