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  1. or download this
    $ perl -MDP -wE'sub foo{DDumper[DDual($_[0])]};foo(42);foo("42");'
[   undef,
...
  IV: SV_UNDEF
  NV: SV_UNDEF
  RV: SV_UNDEF
  2. or download this
    my ($pv, $iv, $nv, $rv, $hm) = DDual ($var [, $getmagic])