bit(1) columns are broken

Ihave the following Doctrine schema:

—
TestTable:
columns:
bitty: bit(1)

I have created the database and table for this. I then have the following PHP code:

$obj1 = new TestTable();
$obj1['bitty'] = b'0';
$obj1->save();

$obj2 = new TestTable();
$obj2['bitty'] = 0;
$obj2->save();

Clearly my attempt is to save the bit value 0 in the bitty column.

However after running this PHP code I get the following odd results:

mysql> select * from test_table;
---------+

---------+

---------+
2 rows in set (0.00 sec)

mysql> select * from test_table where bitty = 1;
---------+

---------+

--------+
2 rows in set (0.00 sec)

mysql> select * from test_table where bitty = 0;
Empty set (0.00 sec)

Those boxes are the 0x01 character, i.e. Doctrine has set the value to 1, not 0.

However I can insert 0's into that table direct from MySQL:

mysql> insert into test_table values (4, b'0');
Query OK, 1 row affected (0.00 sec)

mysql> select * from test_table where bitty = 0;
---------+

---------+

---------+
1 row in set (0.00 sec)

See also this question on StackOverflow http://stackoverflow.com/questions/2008021/php-doctrine-orm-not-able-to-handle-bit1-types-correctly