Regenerates the buffer, necessary when it was persisted

Property definitions

core $ Bytes :: regen
	# Regenerates the buffer, necessary when it was persisted
	private fun regen do
		var nns = new CString(capacity)
		items.copy_to(nns, length, 0, 0)
		persisted = false
	end
lib/core/bytes.nit:570,2--575,4