Make cmp_fast_path more robust #16

Job	Run time
cargo fmt --all -- --check	7s
GNU test suite	48s
cargo clippy -- -D warnings (windows-latest)	44s
cargo test (macOS-latest)	1m 27s
cargo clippy -- -D warnings (macOS-latest)	19s
cargo clippy -- -D warnings (ubuntu-latest)	11s
cargo check (windows-latest)	41s
Code Coverage (windows-latest, windows)	7m 24s
cargo check (ubuntu-latest)	10s
cargo test (ubuntu-latest)	37s
Code Coverage (ubuntu-latest, unix)	1m 54s
cargo test (windows-latest)	4m 33s
cargo check (macOS-latest)	13s
Code Coverage (macos-latest, macos)	2m 33s
	21m 41s

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