[feat] add FirstMatchIndex and ReplaceOrAppend

[muir]

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[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

slice.go:69

• The comment still references 'ReplaceFirstMatchOrAppend' while the function name is 'ReplaceOrAppend'. Consider updating the comment to accurately reflect the function's name.

// ReplaceFirstMatchOrAppend appends the new element unless there is a matching element

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1f625b6) to head (d59b265).

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #6   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          154       169   +15     
=========================================
+ Hits           154       169   +15     

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