upon further consideration, ignoring bad \uuXXXX escape sequences could be dangerous, remove test

src/jsx_decoder.erl

@@ -594,6 +594,8 @@ escape(<<$u, Rest/binary>>, Handler, Stack, Opts) ->
     escaped_unicode(Rest, Handler, Stack, Opts);
 escape(<<>>, Handler, Stack, Opts) ->
     ?incomplete(escape, <<>>, Handler, Stack, Opts);
+escape(Bin, Handler, [Acc|Stack], Opts=#opts{ignore_bad_escapes=true}) ->
+    string(Bin, Handler, [?acc_seq(Acc, ?rsolidus)|Stack], Opts);
 escape(Bin, Handler, Stack, Opts) ->
     ?error([Bin, Handler, Stack, Opts]).
 
@@ -1247,10 +1249,6 @@ ignore_bad_escapes_test_() ->
         {"ignore unrecognized escape sequence", ?_assertEqual(
             decode(<<"[\"\\x25\"]">>, [ignore_bad_escapes]),
             [start_array, {string, <<"\\x25">>}, end_array, end_json]
-        )},
-        {"ignore invalid \\uXXXX escape sequence", ?_assertEqual(
-            decode(<<"[\"\\uFFFF\"]">>, [ignore_bad_escapes]),
-            [start_array, {string, <<"\\uFFFF">>}, end_array, end_json]
         )}
     ].
 

src/jsx_opts.hrl

@@ -6,5 +6,6 @@
     no_jsonp_escapes = false,
     comments = false,
     json_escape = false,
-    dirty_strings = false
+    dirty_strings = false,
+    ignore_bad_escapes = false
 }).

src/jsx_utils.erl

@@ -53,6 +53,8 @@ parse_opts([json_escape|Rest], Opts) ->
     parse_opts(Rest, Opts#opts{json_escape=true});
 parse_opts([dirty_strings|Rest], Opts) ->
     parse_opts(Rest, Opts#opts{json_escape=true});
+parse_opts([ignore_bad_escapes|Rest], Opts) ->
+    parse_opts(Rest, Opts#opts{ignore_bad_escapes=true});
 parse_opts(_, _) ->
     {error, badarg}.
 
@@ -66,7 +68,8 @@ valid_flags() ->
         no_jsonp_escapes,
         comments,
         json_escape,
-        dirty_strings
+        dirty_strings,
+        ignore_bad_escapes
     ].