Make cmp_fast_path more robust #17

Job	Run time
GNU test suite	57s
cargo fmt --all -- --check	6s
cargo test (ubuntu-latest)	37s
cargo clippy -- -D warnings (macOS-latest)	12s
cargo check (macOS-latest)	11s
cargo test (macOS-latest)	1m 27s
cargo test (windows-latest)	4m 4s
cargo clippy -- -D warnings (windows-latest)	1m 47s
cargo check (windows-latest)	41s
cargo check (ubuntu-latest)	21s
Code Coverage (ubuntu-latest, unix)	1m 55s
Code Coverage (windows-latest, windows)	6m 35s
Code Coverage (macos-latest, macos)	2m 28s
cargo clippy -- -D warnings (ubuntu-latest)	10s
	21m 31s

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