Fixes #578 - Do not mutate data in place when applying formatters

[codecov[bot]]

Codecov Report

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

Project coverage is 92.65%. Comparing base (4fd9a68) to head (99c8172).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #579 +/- ## ========================================== + Coverage 92.50% 92.65% +0.15% ========================================== Files 28 28 Lines 2949 2955 +6 ========================================== + Hits 2728 2738 +10 + Misses 221 217 -4 ```

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[claudep]

Thanks!