core: declarative format variable fix

[PapyChacal]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.55%. Comparing base (40b4a68) to head (d261608).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2313   +/-   ##
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  Coverage   89.54%   89.55%           
=======================================
  Files         332      332           
  Lines       39590    39603   +13     
  Branches     5916     5917    +1     
=======================================
+ Hits        35452    35465   +13     
  Misses       3275     3275           
  Partials      863      863           

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[math-fehr]

Arg, I see the problem :/
One other way is to index the operand definition instead, but I agree that getting it from the name seems to be the way to go!
Thanks!