[this comment in the vnode manager] (https://github.com/basho/riak_core/blob/7fc16113303b28b606eb68f07775e7c4a64247b6/src/riak_core_vnode_manager.erl#L640-L642) explains why, i can copy it over. agree the duplication is unfortunate, perhaps more an issue with the return values of `riak_core_ring:vnode_type` which make it difficult to pattern match on multiple at once if fallback is one of them?