Rust

Remove Option from scale #7213

Job	Run time
Format + check + test	7m 29s
android	31s
Check wasm32 + wasm-bindgen	3m 46s
Check Windows	2m 11s
cargo-deny aarch64-apple-darwin	52s
cargo-deny aarch64-linux-android	50s
cargo-deny i686-pc-windows-gnu	50s
cargo-deny i686-pc-windows-msvc	50s
cargo-deny i686-unknown-linux-gnu	55s
cargo-deny wasm32-unknown-unknown	53s
cargo-deny x86_64-apple-darwin	58s
cargo-deny x86_64-pc-windows-gnu	49s
cargo-deny x86_64-pc-windows-msvc	50s
cargo-deny x86_64-unknown-linux-gnu	1m 11s
cargo-deny x86_64-unknown-linux-musl	50s
cargo-deny x86_64-unknown-redox	52s
	24m 37s

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