Kenneth Knowles created BEAM-907:
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             Summary: Allow user to use a specific subclass of BoundedWindow in 
DoFn parameter lists
                 Key: BEAM-907
                 URL: https://issues.apache.org/jira/browse/BEAM-907
             Project: Beam
          Issue Type: Improvement
          Components: sdk-java-core
            Reporter: Kenneth Knowles
            Assignee: Kenneth Knowles
            Priority: Minor


Today, the user adds a {{BoundedWindow}} parameter to {{DoFn}} in order to get 
access to the window of an element. In contrast, for {{RestrictionTracker}} and 
{{State}} the user can place a concrete subclass. We can add this feature 
pretty easily for the window, saving the user a cast.



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