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There are lots of things with /Kids that are not pages. Repair the pages tree, then do a reliable check.
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Also fix a bug in checking consistency of length for stream data providers. Length should not be checked or recorded if the provider says it failed to generate the data.
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I thought /EFF was supposed to be used as a default for decrypting embedded file streams, but actually it's supposed to be advice to a conforming writer about handling new ones. This makes sense since the findAttachmentStreams code, which is not actually needed, was never right.
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When removing unreferenced resources, notice if a page (recursively) contains a form XObject with unreferenced resources, and count any such resources as referenced by the page.