Enumeration of policies for dealing gameplay effect stacks that expire (in duration based effects).
The entire stack is cleared when the active gameplay effect expires
The duration of the gameplay effect is refreshed. This essentially makes the effect infinite in duration. This can be used to manually handle stack decrements via OnStackCountChange callback
The current stack count will be decremented by 1 and the duration refreshed. The GE is not “reapplied”, just continues to exist with one less stacks.