# Shifts the content of the buffer by `len` bytes to the right, starting at byte `from`
	#
	# Internal only, does not modify _byte_length or length, this is the caller's responsability
	private fun rshift_bytes(from: Int, len: Int) do
		var oit = _items
		var nit = _items
		var bt = _byte_length
		if bt + len > capacity then
			capacity = capacity * 2 + 2
			nit = new CString(capacity)
			oit.copy_to(nit, 0, 0, from)
		end
		oit.copy_to(nit, bt - from, from, from + len)
	end