Use int masks

[Baptouuuu]

Fix #5

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (0b2a05e) to head (bd62174).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #6      +/-   ##
============================================
+ Coverage     98.24%   98.28%   +0.03%     
  Complexity      772      772              
============================================
  Files            62       62              
  Lines          2564     2564              
============================================
+ Hits           2519     2520       +1     
+ Misses           45       44       -1     

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