Fix compilation for 32-bit targets #488

Job	Run time
cargo test (macOS-latest)	1m 45s
cargo test (ubuntu-latest)	37s
cargo check (macOS-latest)	20s
cargo clippy -- -D warnings (ubuntu-latest)	16s
cargo test (windows-latest)	4m 7s
cargo check (windows-latest)	47s
cargo check (ubuntu-latest)	32s
cargo fmt --all -- --check	9s
cargo clippy -- -D warnings (windows-latest)	53s
Code Coverage (ubuntu-latest, unix)	1m 50s
Code Coverage (windows-latest, windows)	6m 42s
cargo clippy -- -D warnings (macOS-latest)	40s
GNU test suite	55s
Code Coverage (macos-latest, macos)	3m 17s
	22m 50s

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