Create pub constant Decimal::MAX_SCALE (#685) #1063

Job	Run time
Fuzz Tests	1m 3s
Check file formatting and style	1m 5s
Dependency Tests (stable)	3m 16s
Check documentation	56s
Dependency Tests (beta)	3m 4s
Check minimum rust version	1m 10s
Database Tests - MySQL (stable)	1m 15s
Database Tests - PostgreSQL (stable)	2m 55s
Database Tests - MySQL (beta)	1m 14s
Standard Tests (stable)	2m 19s
Database Tests - PostgreSQL (beta)	2m 43s
Standard Tests (beta)	2m 25s
Database Tests	1s
Test	1s
Pass	1s
	23m 28s

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