Rounding improvement for budget model with `iterations > 1` (#1450) #4201

Job	Run time
check-git-rev-deps	14s
cargo-deny (advisories)	48s
cargo-deny (bans licenses sources)	46s
build-and-test (msrv, 22, ubuntu-latest, wasm32-unknown-unknown, false)	8m 58s
cackle	1m 22s
fmt	14s
build-and-test (msrv, 22, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	18m 49s
build-and-test (latest, 22, ubuntu-latest, wasm32-unknown-unknown, false)	8m 39s
build-and-test (latest, 22, ubuntu-latest-16-cores, x86_64-unknown-linux-gnu, true)	17m 11s
semver-checks	4m 5s
publish-dry-run (ubuntu-latest, wasm32-unknown-unknown) / publish-dry-run / publish-dry-run	24s
publish-dry-run (ubuntu-latest, x86_64-unknown-linux-gnu) / publish-dry-run / publish-dry-run	20s
complete	1s
	1h 1m 51s

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