There are problems when you mix the signal handling style with other modules that use exception handling, or use it in persistent environments like mod_perl so (in my opinion) it is best avoided.
Alternative Exception Handling Techniques in the mod_perl guide has more info on this. Also see the documentation on $^S (in perlvar) and die.
It's often simpler just to override CORE::GLOBAL::die and CORE::GLOBAL::warn.
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