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  1. or download this
    @{"$pkg\::_ATTR"} = @_
    
  2. or download this
    package pkg;
    $_ATTR = 'I am $_ATTR from ' . __PACKAGE__;
    ...
    print "1. $pkg::_ATTR\n";
    print "2. $pkg\::_ATTR\n";
    print "3. ${pkg}::_ATTR\n";