# Gets the length of the character at position `pos` (1 if invalid sequence)
	fun length_of_char_at(pos: Int): Int do
		var c = self[pos]
		if c & 0x80 == 0x00 then
			return 1
		else if c & 0xE0 == 0xC0 and self[pos + 1] & 0xC0 == 0x80 then
			return 2
		else if c & 0xF0 == 0xE0 and self[pos + 1] & 0xC0 == 0x80 and self[pos + 2] & 0xC0 == 0x80 then
			return 3
		else if c & 0xF8 == 0xF0 and self[pos + 1] & 0xC0 == 0x80 and self[pos + 2] & 0xC0 == 0x80 and self[pos + 3] & 0xC0 == 0x80 then
			return 4
		else
			return 1
		end
	end