@abc.abstractmethod
    def remaining_capacity(self):
        pass
Return True if the passed tuple `(a,b)` is a valid range
dataset/ETHPy150Open daviesjamie/spout/spout/queues.py/BufferedQueue.remaining_capacity--crossover with--dataset/ETHPy150Open lsaffre/lino/lino/utils/ranges.py/isrange