feat: add clone ojbect logic in unpackObj

[lukasjhan]

the old UnpackObj function changes the input object. So I changed with clone logic and make old unpackObj rename to unpackObjInternal.

NOTE

• unpackArray function is not exported anymore.

It closes #163

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.01%. Comparing base (b0f6a1b) to head (4647a56).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #181      +/-   ##
==========================================
- Coverage   98.02%   98.01%   -0.01%     
==========================================
  Files          23       23              
  Lines        2074     2068       -6     
  Branches      307      309       +2     
==========================================
- Hits         2033     2027       -6     
  Misses         41       41              

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