Update: In retrospect, I feel kind of stupid for having asked this question and wish I had just thought about it a little more (or at least asked in a less permanent way :). At the very least, though, it has reconfirmed for me the importance of use warnings and maybe next time I won't grumble at the "Use of uninitialized value in numeric eq".
In reply to undef == 0? by stu42j
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