core: make BaseAttr inferrable

[alexarice]

As discussed in #3477

Fixes #3483

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.31%. Comparing base (178e3aa) to head (35cfd4d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3491   +/-   ##
=======================================
  Coverage   90.31%   90.31%           
=======================================
  Files         462      462           
  Lines       58039    58066   +27     
  Branches     5562     5563    +1     
=======================================
+ Hits        52417    52445   +28     
  Misses       4188     4188           
+ Partials     1434     1433    -1     

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[superlopuh]

Thank you