feat: use quotes when reporting issue with string conversion

[ccoVeille]

I faced an issue when testing with "string" string
Then I realized that using quotes would make it clearer.

I chose to use %#q (so backticks are used when possible) for a better readability in logs, as it would avoid reporting with escaped quotes.

• chore: add missing test before a refactoring
• fix: make sure to report the exact string that was provided
• feat: use quotes when reporting issue with string conversion

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0baa892) to head (858b8b0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #125   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          207       207           
=========================================
  Hits           207       207           

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