Returns the index of the type of the SumType's current value in the SumType's Types.
If the SumType is qualified, returns the index of the type in Types whose qualified version matches the SumType's current value.
See Implementation
Returns the index of the type of the SumType's current value in the SumType's Types.
If the SumType is qualified, returns the index of the type in Types whose qualified version matches the SumType's current value.