Use int masks

[Baptouuuu]

Fix #19

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.51%. Comparing base (e8a6549) to head (9f1245b).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #20   +/-   ##
==========================================
  Coverage      91.51%   91.51%           
  Complexity       301      301           
==========================================
  Files             38       38           
  Lines           2158     2158           
==========================================
  Hits            1975     1975           
  Misses           183      183           

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