Fix critical RCE via pickle in _OpaqueObject deserialization.#407
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Also fix types.UnionType (e.g. int | str) being incorrectly handled as an opaque object instead of a typing annotation. PiperOrigin-RevId: 923631121
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Fix critical RCE via pickle in _OpaqueObject deserialization.
Also fix types.UnionType (e.g. int | str) being incorrectly
handled as an opaque object instead of a typing annotation.