Add digit grouping systems

[codecov[bot]]

Codecov Report

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

Comparison is base (40f2c1b) 97.47% compared to head (d1b9ac7) 97.48%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #108 +/- ## ============================================ + Coverage 97.47% 97.48% +0.01% - Complexity 188 194 +6 ============================================ Files 34 35 +1 Lines 3796 3817 +21 ============================================ + Hits 3700 3721 +21 Misses 96 96 ```

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