Rust

Use less RwLocks and Arcs in public interfaces #7

Job	Run time
android	2m 12s
cargo-deny aarch64-apple-darwin	50s
Check wasm32 + wasm-bindgen	4m 11s
cargo-deny aarch64-linux-android	55s
Format + check + test	2m 51s
Check Windows	1m 53s
cargo-deny i686-pc-windows-gnu	58s
cargo-deny i686-pc-windows-msvc	55s
cargo-deny i686-unknown-linux-gnu	48s
cargo-deny wasm32-unknown-unknown	41s
cargo-deny x86_64-apple-darwin	47s
cargo-deny x86_64-pc-windows-gnu	53s
cargo-deny x86_64-pc-windows-msvc	49s
cargo-deny x86_64-unknown-linux-gnu	48s
cargo-deny x86_64-unknown-linux-musl	59s
cargo-deny x86_64-unknown-redox	49s
	21m 19s

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