scovich commented on PR #8324:
URL: https://github.com/apache/arrow-rs/pull/8324#issuecomment-3285709479

   @alamb -- I changed to generic `ParentState<S: BuilderSpecificState>`, could 
you take it for a benchmarking spin so we know what impact it has?
   
   Meanwhile:
   * `VariantBuilderExt` did _not_ become generic -- it can capture the 
genericity with an associated type instead.
   * Changing to generic only seems to have affected code implementing builders 
and parent state; I didn't have to change any use sites. 
   * The PR is still a net win in LoC, in spite of that churn.
   
   Thoughts?


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