Improved overflow support: Update README

[sungshik]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.4%. Comparing base (61ebbb8) to head (58472c5).
Report is 6 commits behind head on improved-overflow-support-main.

Additional details and impacted files

@@                        Coverage Diff                         @@
##             improved-overflow-support-main     #30     +/-   ##
==================================================================
- Coverage                              80.5%   80.4%   -0.2%     
+ Complexity                              131     130      -1     
==================================================================
  Files                                    16      16             
  Lines                                   567     567             
  Branches                                 64      64             
==================================================================
- Hits                                    457     456      -1     
  Misses                                   70      70             
- Partials                                 40      41      +1     

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