Rust

Store `Margin` using `i8` to reduce its size (#5567) #13915

Job	Run time
Format + check + test	2m 26s
Check wasm32+atomics	1m 23s
android	30s
cargo-deny aarch64-apple-darwin	39s
Check wasm32 + wasm-bindgen	2m 34s
ios	27s
cargo-deny aarch64-linux-android	39s
Run tests	2m 21s
cargo-deny i686-pc-windows-gnu	39s
Check Windows	1m 52s
cargo-deny i686-pc-windows-msvc	39s
cargo-deny i686-unknown-linux-gnu	39s
cargo-deny wasm32-unknown-unknown	45s
cargo-deny x86_64-apple-darwin	39s
cargo-deny x86_64-pc-windows-gnu	38s
cargo-deny x86_64-pc-windows-msvc	38s
cargo-deny x86_64-unknown-linux-gnu	41s
cargo-deny x86_64-unknown-linux-musl	37s
cargo-deny x86_64-unknown-redox	38s
	19m 24s

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