def get_value(self, dictionary):
    if html.is_html_input(dictionary) and self.field_name in dictionary:
        # When HTML form input is used, mark up the input
        # as being a JSON string, rather than a JSON primative.
        class JSONString(six.text_type):
            def __new__(self, value):
                ret = six.text_type.__new__(self, value)
                ret.is_json_string = True
                return ret
        return JSONString(dictionary[self.field_name])
    return dictionary.get(self.field_name, empty)