Evaluation of two "!" operators depends on space in beetween

The following expressions don't have the expected result (do not ignore the spaces):

MariaDB [(none)]> select (! !0) = (!!0), (! !1) = (!!1);

+----------------+----------------+

| (! !0) = (!!0) | (! !1) = (!!1) |

+----------------+----------------+

|              0 |              0 |

+----------------+----------------+

1 row in set (0.00 sec)

I would expect that the results are both 1. I would expect that the calculation does not depend on existance of spaces between ! and !.

Changing sql_mode does not change behaviour (HIGH_NOT_PRECEDENCE).

On a MySQL 4.1 server the result of that query is all 1.