_stats built in reduce gives poor error message when emitted value is not a number

Returns:
["Unexpected server error, request logged."]

Should return something like:

{"error":"invalid_value","reason":"builtin _stats function requires map values to be numbers"}

map:
function (doc) {
if (doc["actor"]["name"])

{ emit(doc["actor"]["name"], null); }

}

reduce:
_stats

error:
Server error during processing: ["web request failed",

{path, "/couchBase/default/_design/$dev_test/_view/users"}

,

{type,error}

,

{what,badarg}

,
{trace,
[{erlang,list_to_binary,
[[

{couch_query_servers,builtin_stats, [reduce, [[[<<"Filipe David Borba Manana">>, <<"1bd7139b1036b3130f1e46f92a302cf9">>], null]]]}

,

{couch_query_servers,builtin_reduce,4}

,

{couch_query_servers,reduce,3}

,

{couch_view_group, '-init_group/4-fun-1-',4}

,

{couch_btree, '-write_node/3-lc$^0/1-0-',5}

,

{couch_btree,write_node,3}

,

{couch_btree,modify_node,5}

,

{couch_btree,query_modify,4}

]]},

{couch_httpd,error_info,1}

,

{couch_httpd,send_error,2}

,

{couch_httpd,handle_request_int,6}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

,

{proc_lib,init_p_do_apply,3}

]}]