use mixed underscore and dot

[youkaichao]

inspired by #69

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.69%. Comparing base (cbfbc00) to head (0a9e231).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
- Coverage   90.82%   90.69%   -0.13%     
==========================================
  Files          10       10              
  Lines        1547     1547              
==========================================
- Hits         1405     1403       -2     
- Misses        142      144       +2     

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