core: (ContainerOf) improve python typing

[alexarice]

Improves the python typing bounds on the ContainerOf constraint.

[alexarice]

Nevermind this breaks a load of stuff (seems pyright didn't run locally) fixed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.23%. Comparing base (fa315a7) to head (c047943).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3800      +/-   ##
==========================================
- Coverage   91.23%   91.23%   -0.01%     
==========================================
  Files         461      461              
  Lines       57480    57487       +7     
  Branches     5547     5548       +1     
==========================================
+ Hits        52443    52449       +6     
  Misses       3615     3615              
- Partials     1422     1423       +1     

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[superlopuh]

I like this a lot

[math-fehr]

yes