Use COV_EXCL_LINE

[JeffFessler]

codecov wrongly asserts that the 5 code lines affected here are not covered by the test suite.
They are covered, but the compiler optimizes away these trivial lines, which codecov does not realize.
The comment COV_EXCL_LINE tells codecov to ignore these lines, which reduces PR noise.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b1c4829) to head (baa4cad).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #100      +/-   ##
===========================================
+ Coverage   97.83%   100.00%   +2.16%     
===========================================
  Files           8         8              
  Lines         231       226       -5     
===========================================
  Hits          226       226              
+ Misses          5         0       -5     

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[coveralls]

Coverage Report for CI Build 28367660803

Coverage increased (+2.2%) to 100.0%

Details

• Coverage increased (+2.2%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

---

Coverage Stats

Relevant Lines:	226
Covered Lines:	226
Line Coverage:	100.0%
Coverage Strength:	101.26 hits per line

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💛 - Coveralls