feat: better error message for Map

[pcorpet]

Closes #1228

[codecov]

Codecov Report

Merging #1229 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1229      +/-   ##
==========================================
+ Coverage   94.51%   94.53%   +0.02%     
==========================================
  Files          32       32              
  Lines        1676     1684       +8     
  Branches      404      407       +3     
==========================================
+ Hits         1584     1592       +8     
  Misses         92       92

Impacted Files	Coverage Δ
lib/chai/utils/inspect.js	82.9% <100%> (+0.73%)	⬆️

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[keithamus]

Thanks for this @pcorpet but we're very close to releasing a new version of the inspection engine: chaijs/loupe#14.

Once we get loupe@2 out we'll be updating Chai to use it, and it will replace all inspect code.

We really appreciate the work you've done here! I hope in closing this PR we don't dissuade you from making further contributions!