I think you've made a closure...

my $subref;
{
  my $a = "hi!"
  $subref = sub { print "$a\n" };
  $a = "huh?";
}
&$subref; #prints "huh?"

Is $r->pnotes really making a subref? I'm only starting
to get familiar with Apache.xs but I can tell that
notes is implemented directly on top of an Apache::Table
while pnotes involves much more stuff that I can't
speak about at this time.

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