Commits on Aug 7, 2023

1. A slightly more conservative version of #14128 …

   Two changes
   
    - Fix `hasUpperBound` to work correctly for higher-kinded types
    - A more conservative fix in `IsFullyDefinedAccumulator`. We now maintain
      the symmetry that
   
        - if variance < 0, we maximize
        - if variance > 0 (and Nothing is admissible) we minimize
        - only if variance = 0, we use the upper bound as a tie breaker
   
      Previously, we maximized even if variance > 0 if there was an upper but
      no lower bound. But that was asymmetric since there is no corresponding
      case where we minimize at variance < 0 if there is a lower but no upper
      bound.

   

   odersky committed Aug 7, 2023
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