Fix minor copilot suggestions. #841

Job	Run time
Rust format	21s
Rust check	19s
Rust test	2m 5s
Rust check (windows-latest)	1m 26s
Rust check with default features	21s
Rust check (macos-latest)	41s
Rust lint (nightly)	23s
Rust lint (stable)	23s
Rust lint (beta)	20s
Rust doc	1m 39s
Rust lint	21s
	8m 19s

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