Implement a few polishes and add NotNearlyEqual

[FollowTheProcess]

Summary

[codecov]

Codecov Report

❌ Patch coverage is 85.26316% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.20%. Comparing base (f99220d) to head (1a2a2d2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
test.go	82.05%	11 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
+ Coverage   80.50%   85.20%   +4.70%     
==========================================
  Files           2        2              
  Lines         277      311      +34     
==========================================
+ Hits          223      265      +42     
+ Misses         33       31       -2     
+ Partials       21       15       -6     

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