note
merlyn
If you understand the rule that it's ok to <b>copy</b> undef to another variable, but not <b>use</b> it in an operation, all of these make perfect sense.
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<p>-- [http://www.stonehenge.com/merlyn/|Randal L. Schwartz, Perl hacker]
<p>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.
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