Log Message:
Update to 2.45
--------------
Changes in version 2.45

* Revert behaviour of the combination of <> and pass_through to what
  is was in 2.42.

  Thanks to Wilson Snyder to provide enhancements to the documentation
  to clarify why <> and pass_through generally is a bad idea.

  It is, however, very unfortunate to hear from users that their
  programs *depend* on the undocumented pre-2.43 behaviour.