Unfortunately, this still (if I may use loose language) copies rather than aliasing, hence runs into trouble if $x is a tied variable (probably among other circumstances).
Given
sub Tie::TIESCALAR { return bless \$_[1] => $class }
sub Tie::FETCH { return ${$_[0]} }
sub Tie::STORE { $_[0] = "I'm not tied any more" }
if I replace my $x = 1 by tie my $x, 'Tie', 1, then the given code blows up upon leaving the inner scope.
UPDATE: Oops, $class should be $_[0].
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