It won't bork all scripts with a custom errorhandler if their default action is to ignore core and other errors but only handle the ones they should handle. I do agree that it should be mentioned in the changes file though.
On the other hand you have to be very careful (another way of saying 'avoid') using custom error_handlers anyway because
http://bugs.php.net/bug.php?id=25547
will break your application. Still there in PHP 5.0.0b3RC1
- Chris
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