adapt to LoadingOptions.idx being Final

[mr-c]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.61%. Comparing base (0037b6d) to head (d3a43f5).

❗ There is a different number of reports uploaded between BASE (0037b6d) and HEAD (d3a43f5). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (0037b6d)	HEAD (d3a43f5)
	18	12

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2173      +/-   ##
==========================================
- Coverage   85.16%   77.61%   -7.55%     
==========================================
  Files          46       46              
  Lines        8332     8332              
  Branches     1954     1954              
==========================================
- Hits         7096     6467     -629     
- Misses        771     1346     +575     
- Partials      465      519      +54     

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