Fix `f64` dec limit edge case #1042

Job	Run time
Check documentation	58s
Check file formatting and style	1m 31s
Dependency Tests (stable)	3m 14s
Dependency Tests (beta)	3m 8s
Fuzz Tests	1m 11s
Check minimum rust version	33s
Database Tests - MySQL (stable)	1m 4s
Database Tests - MySQL (beta)	1m 10s
Database Tests - PostgreSQL (stable)	2m 52s
Standard Tests (stable)	58s
Database Tests - PostgreSQL (beta)	2m 43s
Standard Tests (beta)	56s
Database Tests	1s
Test	0s
Pass	0s
	20m 19s

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