gathering levelist as double

[danovaro]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.67%. Comparing base (37662f2) to head (7e4add8).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #101      +/-   ##
===========================================
+ Coverage    61.40%   61.67%   +0.27%     
===========================================
  Files          309      309              
  Lines        11728    11812      +84     
  Branches      1021     1028       +7     
===========================================
+ Hits          7201     7285      +84     
  Misses        4527     4527              

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