Update merge_opts/2 function

src/emqx_misc.erl

@@ -24,15 +24,9 @@
 merge_opts(Defaults, Options) ->
     lists:foldl(
       fun({Opt, Val}, Acc) ->
-                case lists:keymember(Opt, 1, Acc) of
+          lists:keystore(Opt, 1, Acc, {Opt, Val});
-                    true  -> lists:keyreplace(Opt, 1, Acc, {Opt, Val});
-                    false -> [{Opt, Val}|Acc]
-                end;
          (Opt, Acc) ->
-                case lists:member(Opt, Acc) of
+          lists:usort([Opt | Acc])
-                    true  -> Acc;
-                    false -> [Opt | Acc]
-                end
       end, Defaults, Options).
 
 -spec(start_timer(integer(), term()) -> reference()).