There would at least be some ambiguity with single-value lists otherwise:

  numbers: 1, 2, 3

was a list, what would

  numbers: 1

be?

▲ jampekka 5 hours ago | parent [-]

You could have it like in Python tuples where 1 is a scalar and 1, is a tuple.

	▲	xg15 4 hours ago \| parent [-]
		True, but I think that wouldn't be any more intuitive or error safe than the :: syntax.