robertwb commented on PR #34363:
URL: https://github.com/apache/beam/pull/34363#issuecomment-2766789423

   Thanks for following up. 
   
   We had a ClassCastException because of a bug + lack of any testing when 
StringSet was released. I don't know that we need to over-index on this bug 
here (both because we know we should test for it, and also because unlike the 
case with StringSet there's not a variety of Container types that make it hard 
to "guess" which one we should cast to). 
   
   But, as you say, not urgent. 


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