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  1. or download this
    perl -E"$x=chr(0); $x x= 100e6; <>; $r = \substr $x, 50e6; <>"
  2. or download this
    my $ref;
{
...
}

## Here $string persists.
  3. or download this
    my $ref;
{
...
}

## This was the (IMO false) "bug" scenario.