Remove method overriding support

[alganet]

This feature was an anti-pattern from the get go, and it pollutes the implementation and tests.

Implementors can use ->any instead and handle method transitions by themselves.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.51%. Comparing base (dcf5348) to head (55f5159).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #171      +/-   ##
============================================
- Coverage     97.55%   97.51%   -0.04%     
+ Complexity      428      419       -9     
============================================
  Files            30       30              
  Lines          1063     1048      -15     
============================================
- Hits           1037     1022      -15     
  Misses           26       26              

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