hrm i guess its mixed, some do some dont [1] [2]

[1] https://github.com/basho/riak_core/blob/develop/test/hashtree_eqc.erl#L4
[2] https://github.com/basho/riak_core/blob/develop/test/riak_core_service_mgr_tests.erl#L23

I'd vote for having it but don't really care that much