kennknowles commented on PR #39988:
URL: https://github.com/apache/beam/pull/39988#issuecomment-5527529899

   Ah, it turns out this is very hard to change - the mistake dates back to the 
beginning of `Combine` where we deliberately made all identities nullable and 
there is no way around it. So, the current PR isn't adding any nullability.


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