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$ perl -V:uselongdouble\|nvsize
nvsize='16';
uselongdouble='define';
$ perl -MData::Dumper -wE'say Dumper cos 1'
$VAR1 = '0.540302305868139717';

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$ perl5.10.1 -V:uselongdouble\|nvsize
nvsize='8';
...
$ perl5.10.1 -MData::Dumper -wE'say Dumper cos 1'
$VAR1 = '0.54030230586814';
$