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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/56239 Doxygen incorrectly merges base classes from primary templates into their partial specializations. In C++, a specialization's inheritance list completely replaces the primary template's, but Doxygen combines both into a single basecompoundref list. - **Contradictory type traits** — is_optional<std::optional<T>> and is_variant_of_data_types<std::variant<Ts...>> showed inheritance from both std::false_type (primary) and std::true_type (specialization) - **Duplicate base classes** — Converter<jsi::Object> listed ConverterBase<jsi::Object> twice (once from the primary template after substitution, once from the specialization) This diff fixes both issues with two complementary mechanisms: - **Dedup-by-name (Extendable._deduplicate_base_classes)**: removes exact duplicate base classes, keeping the last occurrence. Handles cases where Doxygen's template argument substitution produces identical names. - **Primary template base subtraction (StructLikeScopeKind._remove_merged_primary_bases)**: for partial specializations, looks up the primary template among sibling scopes and performs count-based subtraction of its bases. Count-based (rather than set-based) subtraction correctly preserves bases that a specialization explicitly re-inherits from the same class as the primary. Changelog: [Internal] Reviewed By: cipolleschi Differential Revision: D98291360 fbshipit-source-id: 82b34969b13c7df8babf2c5efc222b29979d6361