Allow for popping a class tier.

[codecov[bot]]

Codecov Report

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

Project coverage is 90.23%. Comparing base (abacab1) to head (907ee8f). Report is 11 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #187 +/- ## ========================================== + Coverage 89.56% 90.23% +0.67% ========================================== Files 14 14 Lines 1322 1352 +30 ========================================== + Hits 1184 1220 +36 + Misses 138 132 -6 ```

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