Move getSummary implementation to cpp

[Levi-Armstrong]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.33%. Comparing base (c22037f) to head (61460ef).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1089      +/-   ##
==========================================
- Coverage   89.41%   89.33%   -0.09%     
==========================================
  Files         288      288              
  Lines       16303    16319      +16     
==========================================
+ Hits        14577    14578       +1     
- Misses       1726     1741      +15     

see 4 files with indirect coverage changes