Yea its easy to hit because even if we do hit `coerce_bool` we wont until after this codepath:

```
$ dev/dev1/bin/riak-admin bucket-type create crdt5 '{"props": {"datatype": "set", "allow_mult": "abc"}}'                                                                                                                                rdb-bucket-type-validator/riak | develop
RPC to 'dev1@127.0.0.1' failed: {'EXIT',
                                 {{{case_clause,error},
                                   [{riak_kv_bucket,validate_create_dt_props,
                                     3,
                                     [{file,"src/riak_kv_bucket.erl"},
                                      {line,226}]},
                                    {riak_kv_bucket,
                                     validate_create_bucket_type,1,
                                     [{file,"src/riak_kv_bucket.erl"},
                                      {line,110}]},
                                    {riak_core_bucket_props,validate,6,
                                     [{file,"src/riak_core_bucket_props.erl"},
                                      {line,51}]},
                                    {riak_core_claimant,handle_call,3,
                                     [{file,"src/riak_core_claimant.erl"},
                                      {line,279}]},
                                    {gen_server,handle_msg,5,
                                     [{file,"gen_server.erl"},{line,585}]},
                                    {proc_lib,init_p_do_apply,3,
                                     [{file,"proc_lib.erl"},{line,239}]}]},
                                  {gen_server,call,
                                   [{riak_core_claimant,'dev1@127.0.0.1'},
                                    {create_bucket_type,<<"crdt5">>,
                                     [{allow_mult,<<"abc">>},
                                      {basic_quorum,false},
                                      {big_vclock,50},
                                      {chash_keyfun,
                                       {riak_core_util,chash_std_keyfun}},
                                      {datatype,set},
                                      {dw,quorum},
                                      {last_write_wins,false},
                                      {linkfun,
                                       {modfun,riak_kv_wm_link_walker,
                                        mapreduce_linkfun}},
                                      {n_val,3},
                                      {notfound_ok,true},
                                      {old_vclock,86400},
                                      {postcommit,[]},
                                      {pr,0},
                                      {precommit,[]},
                                      {pw,0},
                                      {r,quorum},
                                      {rw,quorum},
                                      {small_vclock,50},
                                      {w,quorum},
                                      {young_vclock,20}]},
                                    infinity]}}}
```