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Implements structural equivalence following ISO 32000-2 Annex J, with a recursion depth limit (default 10) in place of cycle detection. Handles numeric promotion, sparse arrays, streams, indirect references, and null/uninitialized normalization. Includes tests in libtests/objects.cc.
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Add a new configurable limit `--max-stream-filters` to address excessive stream filters in damaged or specially constructed PDFs. Update related documentation, tests, and release notes to reflect this feature.
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…pport for configurable global limits via `qpdf_global_get_uint32` and `qpdf_global_set_uint32`.
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Simplify integer value retrieval by introducing a templated `value` method in the `Integer` class. Replace redundant exception handling logic across multiple functions with this unified approach. Streamline type conversions and improve readability.