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$ perl -wE 'say 0 + "1.2"'
1.2
$ perl -wE 'say 0 + "1.2.3"'
Argument "1.2.3" isn't numeric in addition (+) at -e line 1.
1.2

$ perl -wE 'say 0 + !1' # no warning
0
$ perl -wE 'my $false = !1; say "<<$false>>"' # empty string!
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