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  1. or download this
    >perl -MDevel::Peek -e"$_ = '20 ducks'; Dump($_); 0+$_; Dump($_); ''.$
+_; Dump($_);"
...
...
  PV = 0x1639b14 "20 ducks"\0
  CUR = 8
  LEN = 12
  2. or download this
    >perl -wE"$_='20 ducks'; say 0+$_; say 0+$_; say ''.$_; say 0+$_;"
Argument "20 ducks" isn't numeric in addition (+) at -e line 1.
...
20
20 ducks
20