tqchen commented on issue #5314: [RUNTIME][IR] Allow non-nullable ObjectRef, introduce Optional<T>. URL: https://github.com/apache/incubator-tvm/pull/5314#issuecomment-613012133 @MarisaKirisame we don't have to expose optional to python as we can directly use python's Optional for typing. When the normal object typing is used, i believe they are not nullable, the runtime python object themselves are nullable.
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