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$attached = attach_var($target_ref, $attach, [$optional_name]);
$attached = attached($target_ref, [ $optional_name ]);
...
while(my $i = int_span(1,1000000000)){
  print $i,"\n";
}

# Persistant subroutine data
sub somesub {
...
    # The persistant arg hash could be keyed on the caller info if des
+ired
    # for context sensitivity
}