fix(gen): discriminator inference by unique fields

[tdakkota]

Fixes #150.

[codecov]

Codecov Report

Merging #151 (69925cd) into main (276b190) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #151   +/-   ##
=======================================
  Coverage   72.38%   72.38%           
=======================================
  Files          78       78           
  Lines        4838     4838           
=======================================
  Hits         3502     3502           
  Misses       1110     1110           
  Partials      226      226           

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