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#!perl

for $invalue (qw/ 1 -10 abc /) {
...
    }

}

1 appears to be a number.
-10 appears to be a number.
Argument "abc" isn't numeric in add at num.pl line 3.
abc appears to be a number.

#!perl

for $invalue (qw/ 1 -10 abc /) {
...
    }

}

1 appears to be a number.
-10 appears to be a number.
abc is *not* a Number; Details: Argument "abc" isn't numeric in add at
+ num.pl line 4.