Use sorted indices

[xadupre]

Reply to issue #41.

[codecov-commenter]

Codecov Report

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

Project coverage is 87.79%. Comparing base (9753f32) to head (7fc2d1c). Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   87.17%   87.79%   +0.62%     
==========================================
  Files          13       13              
  Lines        1450     1639     +189     
==========================================
+ Hits         1264     1439     +175     
- Misses        186      200      +14     

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