feat(chunk): improve return type

[D-Sketon]

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[codecov-commenter]

Codecov Report

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

Project coverage is 99.26%. Comparing base (72cc2d8) to head (081696f).

Additional details and impacted files

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##             main     #290   +/-   ##
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  Coverage   99.26%   99.26%           
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  Files         125      125           
  Lines         819      819           
  Branches      186      186           
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  Hits          813      813           
  Misses          6        6           

[raon0211]

Hello, thanks for your contribution.

Since we value simplicity of the implementation, we decided not to merge complex types in our repository.

However, other types of contributions such as adding new functions would be really helpful for us. Looking forward to your next contribution.