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?? ??? 2000, Version 4.0.1
+- Changed set_error_handler() to return the name of the previously defined
+ error handler, if any (Zeev, Zend Engine)
- Declared <?php_track_vars?> officially dead. It didn't work in PHP 4.0.0
either, but now it's gone for good (Zeev)
- Make convert_cyr_string() binary safe and stop it from corrupting other