`Signed` improvements #60

Job	Run time
build-docs	57s
rustfmt	15s
clippy	32s
semver	27s
test-and-coverage	2m 37s
wasm-build (1.81.0, wasm32-unknown-unknown)	33s
stable-test (x86_64-unknown-linux-gnu, 1.81.0)	1m 53s
wasm-build (stable, wasm32-unknown-unknown)	32s
	7m 46s

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