lukecwik commented on issue #24801:
URL: https://github.com/apache/beam/issues/24801#issuecomment-1370241600

   In general `ReadableState.read()` should not be `@Nullable` but we should 
allow for the overrides like `ValueState` to specify that `T` can be 
`@Nullable` while others like `ListState` we should have `List<@Nullable T>`.
   
   There was some discussion on the mailing list about this:
   https://lists.apache.org/thread/71q9xtb9vgj08d0qnbjbp1p10gxnnn1x


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