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  1. or download this
    $ perl -MDevel::Peek -e'Dump(1 < 2)'
SV = PVNV(0xa1046e4) at 0xa102520
...
  PV = 0x947a6c8 ""\0
  CUR = 0
  LEN = 12
  2. or download this
    $ perl -e'$x = \(1 < 2); $$x++'
Modification of a read-only value attempted at -e line 1.