Add allow list for keys (properties) to include in errors.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.94%. Comparing base (6547df8) to head (544e3af).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   81.89%   81.94%   +0.04%     
==========================================
  Files          15       15              
  Lines        4077     4088      +11     
==========================================
+ Hits         3339     3350      +11     
  Misses        738      738              

Files	Coverage Δ
lib/helpers.js	93.87% <100.00%> (+0.36%)	⬆️

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