chore: fix clippy #520

Job	Run time
check_features (ubuntu, --features serde)	18s
check_features (ubuntu, --features serde)	18s
check_features (ubuntu, --features datasets)	25s
check_features (ubuntu, --features datasets)	25s
tests (windows, x86_64-pc-windows-msvc)	1m 22s
tests (windows, x86_64-pc-windows-msvc)	1m 29s
check_features (ubuntu)	27s
check_features (ubuntu)	27s
tests (windows, i686-pc-windows-msvc)	1m 21s
tests (windows, i686-pc-windows-msvc)	1m 34s
tests (ubuntu, x86_64-unknown-linux-gnu)	1m 20s
tests (ubuntu, x86_64-unknown-linux-gnu)	1m 20s
tests (ubuntu, i686-unknown-linux-gnu)	31s
tests (ubuntu, i686-unknown-linux-gnu)	31s
tests (ubuntu, wasm32-unknown-unknown)	1m 23s
tests (ubuntu, wasm32-unknown-unknown)	1m 27s
tests (macos, aarch64-apple-darwin)	1m 12s
tests (macos, aarch64-apple-darwin)	1m 12s
tests (ubuntu, wasm32-wasi)	51s
tests (ubuntu, wasm32-wasi)	51s
	18m 44s

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