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This property determines if the file identifiers should be constant
rather than unique.
PDF documents have two unique file identifiers. One is a file specific
identifier which stays constant throughout the life of the file.
The other is a file version identifier which is updated every time
the document is saved.
This property allows you to ensure that the same identifiers are
always used. This can be useful for debugging if you need to do
a binary level comparison of files and you need to ensure that random
elements have been eliminated.
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