fix(gen): use Rat.SetString instead of UnmarshalText

[tdakkota]

No description provided.

[codecov]

Codecov Report

Base: 74.18% // Head: 74.19% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (110347b) compared to base (adf8110).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #655   +/-   ##
=======================================
  Coverage   74.18%   74.19%           
=======================================
  Files         170      170           
  Lines       11881    11885    +4     
=======================================
+ Hits         8814     8818    +4     
  Misses       2609     2609           
  Partials      458      458           

Impacted Files	Coverage Δ
gen/write.go	88.94% <100.00%> (+0.20%)	⬆️
validate/float.go	100.00% <100.00%> (ø)

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