def istrue(self, *args):
def is_true(val):<EOL><INDENT>if val is True:<EOL><INDENT>return True<EOL><DEDENT>val = str(val).lower().strip()<EOL>return val in ('<STR_LIT:true>', '<STR_LIT:yes>', '<STR_LIT:1>')<EOL><DEDENT>return all(self._arg_factory(is_true, args))<EOL>
Strict test for 'true' value test. If multiple args are provided it will
        test them all.
            ISTRUE:true

        %{ISTRUE:true} -> 'True'