Merge `Round` methods #208

Job	Run time
rustfmt	4s
build-docs	32s
clippy	40s
semver	22s
stable-test (x86_64-unknown-linux-gnu, 1.81.0)	43s
test-and-coverage	42s
wasm-build (1.81.0, wasm32-unknown-unknown)	25s
wasm-build (stable, wasm32-unknown-unknown)	19s
	3m 47s

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