[2.5] support group size and strict_group_size

[shanghaikid]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.23%. Comparing base (9f46da2) to head (c091da9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #371   +/-   ##
=======================================
  Coverage   97.22%   97.23%           
=======================================
  Files          43       43           
  Lines        2776     2780    +4     
  Branches      669      671    +2     
=======================================
+ Hits         2699     2703    +4     
  Misses         77       77           

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