[perl #46817] [RFC] Should Undef generate a warning?

[chromatic via RT]

If we're going to retain optional warnings, we should take advantage of
them.  The attached patch adds an optional warning to the Undef PMC when
stringifying it.  It's simple to add similar warnings when numifying and
intifying it.  Those are the only places where the warning makes sense
to me.

-- c
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