fix: validate UTF-8 inside tag during parsing

[tdakkota]

Fixes #53

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (01c0d21) 77.41% compared to head (92f6fe7) 77.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   77.41%   77.43%   +0.01%     
==========================================
  Files          22       22              
  Lines        7257     7262       +5     
==========================================
+ Hits         5618     5623       +5     
  Misses       1264     1264              
  Partials      375      375              

Impacted Files	Coverage Δ
decode.go	86.19% <100.00%> (-0.04%)	⬇️
parserc.go	87.51% <100.00%> (+0.09%)	⬆️

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