fix heterogeneous testcase and rebuild samples

[divarvel]

• the heterogeneous equals sample had an issue, and the readme.md / samples.json files had not been regenerated
• the array/map sample description has been edited for consistency

Code coverage checks are a bit finicky

[codspeed-hq]

CodSpeed Performance Report

Merging #244 will not alter performance

_{Comparing fix-heterogeneous-equals-sample (3930767) with v5 (e59f41d)}

Summary

✅ 12 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.03%. Comparing base (d90accd) to head (3930767).
Report is 4 commits behind head on v5.

Additional details and impacted files

@@            Coverage Diff             @@
##               v5     #244      +/-   ##
==========================================
+ Coverage   68.96%   69.03%   +0.07%     
==========================================
  Files          25       25              
  Lines        5922     5926       +4     
==========================================
+ Hits         4084     4091       +7     
+ Misses       1838     1835       -3     

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