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  DB<116> use warnings;0+"2"
 => 2
...

  DB<119> use warnings;0+"3ss2"
Argument "3ss2" isn't numeric in addition

>>> a="ss2";  0+parseInt(a)
NaN
>>> a="3ss2";  0+parseInt(a)
3

>>> a="2";  0+a
"02"
>>> a="2";  0+a-0
2