Rust

Tighten up `saturating_` math checks #3365

Job	Run time
check-git-rev-deps	14s
build-and-test (ubuntu-latest, wasm32-unknown-unknown, false)	2m 48s
cackle	1m 22s
cargo-deny (advisories)	6m 25s
build-and-test (ubuntu-latest, x86_64-unknown-linux-gnu, true)	8m 44s
cargo-deny (bans licenses sources)	6m 20s
fmt	13s
publish-dry-run	0s
rust-analyzer-compat	2m 34s
complete	1s
	28m 41s

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