`Signed` improvements #48

Job	Run time
rustfmt	12s
semver	31s
build-docs	54s
clippy	30s
stable-test (x86_64-unknown-linux-gnu, 1.81.0)	1m 47s
test-and-coverage	2m 20s
wasm-build (1.81.0, wasm32-unknown-unknown)	31s
wasm-build (stable, wasm32-unknown-unknown)	49s
	7m 34s

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