Support nullable optionals and generic collections#921
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Jackson property type inference only recognized List as a CEL list-like type and treated Optional as an object-like value. Runtime adaptation had the same List-only limitation and returned Optional values as ordinary objects. Generalize runtime list adaptation to Collection, unwrap Optional values to either their contained CEL value or null, and teach the Jackson 2 and Jackson 3 type descriptors to infer Collection<T> as list<T> and Optional<T> as T. Add regression coverage for Collection, Set, Optional.of, Optional.empty, and nested Optional values.
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Jackson property type inference only recognized List as a CEL list-like type and treated Optional as an object-like value. Runtime adaptation had the same List-only limitation and returned Optional values as ordinary objects.
Generalize runtime list adaptation to Collection, unwrap Optional values to either their contained CEL value or null, and teach the Jackson 2 and Jackson 3 type descriptors to infer Collection as list and Optional as T. Add regression coverage for Collection, Set, Optional.of, Optional.empty, and nested Optional values.