test: clarify supported Node.js versions and add compatibility tests

[lumirlumir]

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[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9b5c0fa) to head (eaa9878).
Report is 1 commits behind head on main.

@@            Coverage Diff            @@
##              main       #44   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            7         7           
=========================================
  Hits             7         7           

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