refine: remove assignedCount method

[JacksonTian]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5516f5e) 83.23% compared to head (ca9c633) 83.19%.

❗ Current head ca9c633 differs from pull request most recent head 5a3cdb0. Consider uploading reports for the commit 5a3cdb0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #873      +/-   ##
==========================================
- Coverage   83.23%   83.19%   -0.04%     
==========================================
  Files          47       47              
  Lines        3250     3244       -6     
==========================================
- Hits         2705     2699       -6     
  Misses        414      414              
  Partials      131      131              

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