Rust

Serialize as `None` #13400

Job	Run time
Check wasm32+atomics	1m 20s
Check wasm32 + wasm-bindgen	2m 24s
Format + check + test	2m 38s
android	22s
cargo-deny aarch64-apple-darwin	39s
ios	22s
cargo-deny aarch64-linux-android	42s
cargo-deny i686-pc-windows-gnu	38s
cargo-deny i686-pc-windows-msvc	39s
Run tests	1m 44s
cargo-deny i686-unknown-linux-gnu	42s
Check Windows	2m 16s
cargo-deny wasm32-unknown-unknown	38s
cargo-deny x86_64-apple-darwin	42s
cargo-deny x86_64-pc-windows-gnu	39s
cargo-deny x86_64-pc-windows-msvc	38s
cargo-deny x86_64-unknown-linux-gnu	38s
cargo-deny x86_64-unknown-linux-musl	39s
cargo-deny x86_64-unknown-redox	40s
	19m 0s

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