Fix bug with oneOf and const #1787

[shadchin]

This fixes the problem #1787, but I'm not sure if this is the right place.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@b453321). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1791   +/-   ##
=======================================
  Coverage        ?   98.98%           
=======================================
  Files           ?       37           
  Lines           ?     4149           
  Branches        ?      967           
=======================================
  Hits            ?     4107           
  Misses          ?       26           
  Partials        ?       16           

Flag	Coverage Δ
unittests	98.67% <0.00%> (?)

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[codspeed-hq]

CodSpeed Performance Report

Merging #1791 will not alter performance

_{Comparing shadchin:patch-1 (f3f1923) with main (b453321)}

Summary

✅ 29 untouched benchmarks

[koxudaxi]

Thank you very much!!