CouchDB rewriting

cdbr

in _design/simple

"rewrites": [
       {
           "from": "/all",
           "to": "_list/html/all_database_types",
           "method": "GET",
           "query": {
               "reduce": false
           }
       }
]

firing:
http://127.0.0.1:5984/map-reduce/_design/simple/_rewrite/all/

result:
{"error":"unknown_error","reason":"badarg"}

stack trace:
[error] [<0.26698.0>] Badarg error in HTTP request
[info] [<0.26698.0>] Stacktrace: [{erlang,iolist_to_binary,[false],[]},
                                  {couch_httpd_rewrite,
                                      '-maybe_encode_bindings/1-fun-0-',2,
                                      [{file,"couch_httpd_rewrite.erl"},
                                       {line,453}]},
                                  {lists,foldl,3,
                                      [{file,"lists.erl"},{line,1197}]},
                                  {couch_httpd_rewrite,handle_rewrite_req,3,
                                      [{file,"couch_httpd_rewrite.erl"},
                                       {line,147}]},
                                  {couch_httpd_db,do_db_req,2,
                                      [{file,"couch_httpd_db.erl"},
                                       {line,230}]},
                                  {couch_httpd,handle_request_int,5,
                                      [{file,"couch_httpd.erl"},{line,317}]},
                                  {mochiweb_http,headers,5,
                                      [{file,"mochiweb_http.erl"},{line,136}]},
                                  {proc_lib,init_p_do_apply,3,
                                      [{file,"proc_lib.erl"},{line,227}]}]
[error] [<0.26698.0>] Uncaught server error: badarg
[info] [<0.26698.0>] 127.0.0.1 - - GET /map-reduce/_design/simple/_rewrite/all/ 500

the solution:

"query": {
"reduce": "false"
}

only strings are allowed!