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[bot]]

CodSpeed Performance Report

Merging #244 will not alter performance

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

Summary

✅ 12 untouched benchmarks

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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