+------+-------+-------+
| true | false | final |
+------+-------+-------+
|   0  |   0   |   0   |  Foo::new()
+------+-------+-------+
|   0  |   1   |   1   |  Foo->new()
+------+-------+-------+
|   1  |   x   |   1   |  $foo->new()
+------+-------+-------+