def __iter__(self):
        curr = self
        while curr:
            r, curr = curr.extract()
            yield r
Return a list of keys in archive.
dataset/ETHPy150Open kachayev/fn.py/fn/immutable/heap.py/_MergeBased.__iter__--crossover with--dataset/ETHPy150Open yinhm/datafeed/datafeed/datastore.py/Minute.keys