Update to Optik 1.4.1; here are the relevant bits of the change log:

* Fixed some long-hidden bugs revealed by the new PyUnit-based
    test suite (thanks to Johannes Gijsbers the new test suite,
    improved tests that caught the bugs, and the bug fixes).

  * Make store_true/store_false store True/False rather than 1/0.

Details available in Optik's CVS repository.