Inspection built an annotation record, with owned copies of its text,
for every /Annots entry on every page, so one comment referenced many
times, a page-shared /Annots array, or many small comments sharing one
long /Contents string multiplied that text in memory. Pages are read in
order, an annotation or /Annots array already listed is skipped, and
the listing stops once the kept text and geometry pass 64 MiB.
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