I implemented this functionality about a year ago (if I'm not mistaken it was part of the original ZE2 tree).
The reason we removed it (IIRC) was that we thought it would lead to cleaner PHP code and would force only objects being thrown (although this can be done in other ways).
I would like to keep things as-is because I think it's cleaner this way. Give the developer the benefit of the tought that he can design his Exception hierarchy in a good way, wether he inherits from our "Exception" class or from his own exception class.
Andi
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