Fix incorrect decimal digits bug #2129

Job	Run time
Test feature matrix	10m 38s
Lint	36s
Test FFI (stable, ubuntu-latest)	35s
Documentation	31s
Test (stable, ubuntu-latest)	35s
Test (stable, windows-latest)	1m 27s
MSRV	25s
Test (stable, macos-latest)	50s
	15m 37s

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