should always be a single element b/c of the check that you mentioned needs a comment in `schedule_resize_transfer` [1]. Originally was going to say, lets just change it to pull the head of the list but actually i think I'd prefer it crash because if we have multiple resize transfers scheduled for the same target we a have a problem and this may be way less subtle than some other funky things i can imagine happening. Also, thats where the keyfind comment originated from fwiw (not really smart use of LC here on my part imo) 

[1] https://github.com/basho/riak_core/pull/301#discussion_r4371567