lib: avoid event override by assignment

[erights]

See #43907

[ljharb]

With this last comment, and with some tests (that install an inherited setter and verify it's not called, and then remove the setter, presumably) this PR LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.86%. Comparing base (db18bc8) to head (f1958ee).
⚠️ Report is 2793 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #58315      +/-   ##
==========================================
- Coverage   89.87%   89.86%   -0.01%     
==========================================
  Files         656      656              
  Lines      192956   192993      +37     
  Branches    37846    37842       -4     
==========================================
+ Hits       173411   173429      +18     
- Misses      12103    12110       +7     
- Partials     7442     7454      +12     

Files with missing lines	Coverage Δ
lib/events.js	99.84% <100.00%> (+0.25%)	⬆️

... and 26 files with indirect coverage changes

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[github-actions]

This pull request has been marked as stale due to 90 days of inactivity.
It will be automatically closed in 30 days if no further activity occurs. If this is still relevant, please leave a comment or update it to keep it open.

[erights]

This PR is still relevant.

@ljharb you LGTMed it. Did you also approve it? Do you have the power?

Who should I ping to take a look at it? Who else should be a reviewer?

[erights]

@aduh95 ?
@Mesteery ?