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Scalar::Util - A selection of general-utility scalar subroutines - Perldoc Browser
Scalar::Util
| perldoc.perl.org
perlref - Perl references and nested data structures - Perldoc Browser
perlref
| perldoc.perl.org
perlobj - Perl object reference - Perldoc Browser
perlobj
| perldoc.perl.org
