[stephenworsley]

Addresses #6755 (until a better solution is implemented).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.37%. Comparing base (af100e4) to head (b3bbc3a).
⚠️ Report is 81 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6767      +/-   ##
==========================================
+ Coverage   90.30%   90.37%   +0.06%     
==========================================
  Files          91       91              
  Lines       24674    24746      +72     
  Branches     4623     4635      +12     
==========================================
+ Hits        22282    22363      +81     
+ Misses       1620     1610      -10     
- Partials      772      773       +1     

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[pp-mo]

The mechanics looks fine, and I'm sure it works.
Some suggestions though about : increasing user clarity; supporting permanent setting; testing for both cases

[pp-mo]

Thanks @stephenworsley . All good now, I think.

I had previously sort-of skipped over the use of __bool__, which allows if _CONCRETE_DERIVED_LOADING:
That is cool 😎 !