Decimal casting #4269

Job	Run time
Python (wheel build)	5m 33s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=28059376451/runner=arm64-medium/imag...	1m 54s
Rust publish dry-run	24s
Compat check / compat-test	5m 29s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=28059376451/runner=amd64-medium/image...	1m 21s
	14m 41s

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