# Low-level creation of a new string with all the data.
	#
	# `_items` will be used as is, without copy, to retrieve the characters of the string.
	# Aliasing issues is the responsibility of the caller.
	private new full(items: CString, byte_length, from, length: Int)
	do
		if byte_length == length then return new ASCIIFlatString.full_data(items, byte_length, from, length)
		return new UnicodeFlatString.full_data(items, byte_length, from, length)
	end