Release 4.0.0

[kelvinhammond]

This merges in the commits that are only present in the tag but not the main branch.

[kelson42]

I don't understand what is the problem we have here? We never tag a release on a commit which is not also on main branch (in particular for a major release).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (401079d) to head (3eb7be4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #175   +/-   ##
===========================
===========================

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