id	summary	reporter	owner	description	type	status	priority	milestone	version	resolution	keywords	cc
2	cons, snoc, (++) and concat should use copy when possible	rl		At the moment, they always use the stream/unstream route. If no fusion happens, we'd be much better off simply doing a memcpy for unboxed vectors.	enhancement	closed	critical	0.10	0.6	fixed