fix(yaml): fix sortKey error message

[timreichen]

Changes
This PR fixes the sortKey error message with template string and adds a test.

⚠️ Note
Instead of throwing an error, we might want to remove this type check completely, because it should be covered by typescript.

if (typeof this.sortKeys === "function") {
  objectKeyList.sort(this.sortKeys);
} else if (this.sortKeys) {
  objectKeyList.sort();
}

WDYT?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.36%. Comparing base (94a7e1b) to head (f793168).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5873      +/-   ##
==========================================
+ Coverage   96.35%   96.36%   +0.01%     
==========================================
  Files         479      479              
  Lines       38674    38675       +1     
  Branches     5631     5632       +1     
==========================================
+ Hits        37263    37269       +6     
+ Misses       1367     1363       -4     
+ Partials       44       43       -1     

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[iuioiua]

Wow - what a funny/strange bug. Thanks! We're currently in an undecided state regarding runtime type checking of values, so let's keep the current behavior, even though I think it should go.