fix: Correct boundary check in SecondaryCode

[ciscorn]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.87%. Comparing base (821397a) to head (61f18d8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #4   +/-   ##
=======================================
  Coverage   95.87%   95.87%           
=======================================
  Files           3        3           
  Lines         995      995           
=======================================
  Hits          954      954           
  Misses         41       41           

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