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We need to know whether pushInheritedAttributesToPage or getAllPages have been called when generating JSON output. When reading the JSON back in, we have to call the same methods so that object numbers will line up properly.
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Also, use methods to access objid and generation.
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Remove redundant variables pages and next.
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When there is no context for writing output or error messages, use the default logger.
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This includes the output PDF, streams from --show-object and attachments from --save-attachment. This also enables --verbose and --progress to work with saving to stdout.