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PDF objects vary in complexity from simple values (booleans, integers, floats, names, etc) to more complex entities (arrays, dictionaries, streams, indirect references etc). While the simplest object types are independent of any particular document, the more complex types are implicitly bound to the document in which they appear.
Most of the time this is all taken care of automatically by the MuPDF core, but special care must be taken when trying to copy objects from one PDF file to another.