Fix incorrect decimal digits bug #2125

Job	Run time
MSRV	27s
Lint	36s
Documentation	33s
Test feature matrix	11m 57s
Test FFI (stable, ubuntu-latest)	32s
Test (stable, windows-latest)	1m 35s
Test (stable, ubuntu-latest)	31s
Test (stable, macos-latest)	45s
	16m 56s

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