fix(takeRight): improve test coverage and remove redundant checks

[wo-o29]

Summary

Improved the takeRight function implementation to achieve 100% branch coverage and remove unnecessary defensive code.

Before	After

Changes

• Changed count parameter from default value count = 1 to optional count?: number to eliminate redundant initialization logic
• Improved test coverage from 90% to 100% in the Branch category by removing duplicate initialization paths
• Removed unnecessary arr == null check since the type signature readonly T[] already prevents null/undefined at compile time

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Project	Deployment	Preview	Comments	Updated (UTC)
es-toolkit	Ready	Preview	Comment	Oct 9, 2025 3:34pm

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.90%. Comparing base (21bd853) to head (231720c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1451   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files         468      468           
  Lines        4439     4439           
  Branches     1309     1308    -1     
=======================================
  Hits         4435     4435           
  Misses          4        4           

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[sukvvon]

Hello! @wo-o29 I've created a PR(#1452) for what you were concerned about! 😄