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c:\@Work\Perl\monks>perl -wMstrict -MData::Dumper -le
"my $x = '1.23' + qq{0.34 \t\n\r} + '5.6e3' + '100';
...
$VAR1 = '5800.17';

$VAR1 = '5800.17';

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c:\@Work\Perl\monks>perl -wMstrict -MData::Dumper -le
"my $x = <STDIN>;
...
';

$VAR1 = '59.04';