Doesn't keeping the elements in @_ basically have the same effect since they are aliases to the values in the use statement?

package Set;
sub import
{
  our $var = \$_[1];
}
1;
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With this module, perl -e "use Set (my $x = 6,); $$Set::var++; will work but perl -e "use Set (6,); $$Set::var++;

will fail because "Modification of a read-only value attempted at -e line 1."