# Create a range [`from`, `to`[.
	# The syntax `[from..to[` is equivalent.
	#
	#     var a = [10..15[
	#     var b = new Range[Int].without_last(10,15)
	#     assert a == b
	#     assert a.to_a == [10, 11, 12, 13, 14]
	init without_last(from: E, to: E)
	do
		first = from
		if from <= to then
			last = to.predecessor(1)
			after = to
		else
			last = to.successor(1)
			after = to
		end
	end