in reply to is_numeric

Very clever.

Perhaps too clever? 

print is_numeric([]) ? "yes\n" : "no\n";

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yes

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A word spoken in Mind will reach its own level, in the objective world, by its own weight

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Re^2: is_numeric
by GrandFather (Saint) on Apr 11, 2007 at 21:25 UTC 
      return eval { ! ref $x and $x == $x };

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    is a light weight way to fix that case.

    DWIM is Perl's answer to Gödel
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[d/l]
      But if you do that, objects that overload numerification to return a number won't be considered numbers...
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In Section Cool Uses for Perl