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  1. or download this
    C:\>perl -MScalar::Util -MDevel::Peek -le "Dump(Scalar::Util::looks_li
+ke_number('abc'));"
SV = PVNV(0x726f74) at 0x723250
...
  PV = 0x7229b4 ""\0
  CUR = 0
  LEN = 12
  2. or download this
    C:\>perl -MScalar::Util -MDevel::Peek -le "Dump(Scalar::Util::looks_li
+ke_number('abc'));
SV = PVNV(0x2ea0a8) at 0x2e8150
...
  PV = 0x6ff24e83 ""
  CUR = 0
  LEN = 0