add ForceJSON option for string decoding

[muir]

Now strings can be decoded using JSON

Also: updated lint github action; added additional Go version to github actions

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 81.51%. Comparing base (abaed17) to head (967562a).

Files	Patch %	Lines
unpack.go	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   81.50%   81.51%           
=======================================
  Files           6        6           
  Lines         373      384   +11     
=======================================
+ Hits          304      313    +9     
- Misses         44       45    +1     
- Partials       25       26    +1     

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