docs: def _rate_limited():
          """A rate limit decorator for limiting the number of times the
          decorated :class:`Miner` method can be called. Limits are set in
          :attr:`Miner._max_per_second`.
          """
          def decorate(func):
              def rate_limited_func(self, *args, **kwargs):
                  elapsed = time.monotonic() - self._last_time_called
                  self.left_to_wait = self._min_interval - elapsed
                  if self.left_to_wait > 0:
                      time.sleep(self.left_to_wait)
                  func(self, *args, **kwargs)
                  self._last_time_called = time.monotonic()
                  yield from func(self, *args, **kwargs)
              return rate_limited_func
          return decorate