Why do we need to make GridRange start and end unbounded on same axes?

[onlined]

pygsheets/pygsheets/address.py

Lines 416 to 420 in 9ba1a6d

	# If one axes is unbounded on an index, make other index also unbounded on same axes
	if self._start[0] is None or self._end[0] is None:
	self._start[0], self._end[0] = None, None
	elif self._start[1] is None or self._end[1] is None:
	self._start[1], self._end[1] = None, None

I can use worksheet.get_values('D2', 'D') as expected (yes, all column D except D1) if I comment out the lines above. But if I don't, it works like worksheet.get_values('D', 'D'). Why was it needed to do this before?