To offer an alternative to users who require fractional numbers in score calculation, implement a MilliScore type (and possibly other score types with different precision) that internally represent the factional number by a Java long type with fixed precision.

See https://kie.zulipchat.com/#narrow/stream/235756-optaplanner-dev/topic/BendableScore.20backed.20by.20normal.20score.3F for more context.

See the PoC done for this feature:
https://issues.redhat.com/browse/PLANNER-2895