mochijson2 does not validate input strings after encountering an escape character

This example throws invalid_json (as it should, <<169>> is not a valid UTF-8 byte sequence)

1> couch_util:json_decode(<<$", "abc", 169, $">>).

• • exception throw: {invalid_json,<<"\"abc©\"">>}

    in function couch_util:json_decode/1

but this example does not

2> couch_util:json_decode(<<$", "abc
n", 169, $">>).
<<"abc\n©">>