/*
 * call-seq: to_json(*)
 *
 * Converts this object to a string (calling #to_s), converts
 * it to a JSON string, and returns the result. This is a fallback, if no
 * special method #to_json was defined for some object.
 */
static VALUE mObject_to_json(int argc, VALUE *argv, VALUE self)
{
    VALUE string = rb_funcall(self, i_to_s, 0);
    Check_Type(string, T_STRING);
    return mString_to_json(argc, argv, string);
}