Faster `minmax` by using `fold`

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.67%. Comparing base (6814180) to head (f798d5a). Report is 111 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #968 +/- ## ========================================== + Coverage 94.38% 94.67% +0.28% ========================================== Files 48 49 +1 Lines 6665 7232 +567 ========================================== + Hits 6291 6847 +556 - Misses 374 385 +11 ```

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