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It is important that we cache this because we might find a lot of symbols in the same container for eg. workspace symbols (eg. consider many symbols in the same C++ namespace). If we didn't cache this value, then we would need to perform a `primaryDefinitionOrDeclarationOccurrence` lookup for all of these containers, which is expensive. For example, searching for `only` in SourceKit-LSP’s codebase used to not return results in more than 20s (after which I gave up) and now returns >8000 results in <2s. rdar://141412138