docs: def element_at(self, index):
          '''Return the element at ordinal index.
  
          Note: This method uses immediate execution.
  
          Args:
              index: The index of the element to be returned.
  
          Returns:
              The element at ordinal index in the source sequence.
  
          Raises:
              ValueError: If the Queryable is closed().
              ValueError: If index is out of range.
          '''
          if self.closed():
              raise ValueError("Attempt to call element_at() on a "
                               "closed Queryable.")
  
          if index < 0:
              raise OutOfRangeError("Attempt to use negative index.")
  
          # Attempt to use __getitem__
          try:
              return self._iterable[index]
          except IndexError:
              raise OutOfRangeError("Index out of range.")
          except TypeError:
              pass
  
          # Fall back to iterating
          for i, item in enumerate(self):
              if i == index:
                  return item
          raise OutOfRangeError("element_at(index) out of range.")