public override Task<long> ReadHighestSequenceNrAsync(
	string persistenceId,
	long fromSequenceNr
)

abstract ReadHighestSequenceNrAsync : 
        persistenceId : string * 
        fromSequenceNr : int64 -> Task<int64> 
override ReadHighestSequenceNrAsync : 
        persistenceId : string * 
        fromSequenceNr : int64 -> Task<int64>