Add support to pass mask as string

[codecov[bot]]

Codecov Report

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

Comparison is base (b5c698d) 93.50% compared to head (7b3a408) 93.52%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #36 +/- ## ========================================== + Coverage 93.50% 93.52% +0.01% ========================================== Files 11 11 Lines 493 494 +1 ========================================== + Hits 461 462 +1 Misses 32 32 ```

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