feat: support conversion of custom types

[danielebriggi]

feat: support conversion of custom types#20
fix: return error for unsupported type

[codecov-commenter]

Codecov Report

❌ Patch coverage is 69.69697% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 4.32%. Comparing base (96998e1) to head (c0c17b1).

Files with missing lines	Patch %	Lines
chunk.go	69.69%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #20      +/-   ##
========================================
+ Coverage   4.08%   4.32%   +0.23%     
========================================
  Files         10      10              
  Lines       2250    2265      +15     
========================================
+ Hits          92      98       +6     
- Misses      2149    2157       +8     
- Partials       9      10       +1     

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