🎉 unknownutil v4

[lambdalisue]

• [x] :boom: Remove deprecated features
• [x] :boom: Remove isXXXXX functions (only expose is.XXXXX functions)
• etc.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.23%. Comparing base (57e6c7a) to head (f2cacc6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
- Coverage   99.29%   99.23%   -0.07%     
==========================================
  Files           5        5              
  Lines         564      520      -44     
  Branches       87       82       -5     
==========================================
- Hits          560      516      -44     
  Misses          4        4              

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