Backport "A slightly more conservative version of #14218" #18371
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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.
This was referenced Aug 9, 2023
WojciechMazur
approved these changes
Aug 9, 2023
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Backports #18352