extractSelf convenience helper

[pshirshov]

I'm not sure if this is the best option. Maybe we should do this by default and override with extractWith.

[pshirshov]

Ah, it's already like this since last refactoring. Maybe we still should add this method to allow users to have more clarity in their code.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 66.57%. Comparing base (a708866) to head (ad8920e).
⚠️ Report is 172 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2232      +/-   ##
===========================================
- Coverage    66.60%   66.57%   -0.04%     
===========================================
  Files          594      594              
  Lines        11653    11654       +1     
  Branches      1340     1389      +49     
===========================================
- Hits          7762     7759       -3     
- Misses        3891     3895       +4     

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