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$pdf->update()
    Saves a previously opened document.

...
    Remove the object structure from memory. PDF::API2 contains circul
+ar references, so this call is necessary in long-running processes to
+ keep from running out of memory.

    This will be called automatically when you save or stringify a PDF
+.

#!/usr/bin/perl
use 5.018;
use PDF::API2;
...
}

closedir $DIR;