WithUnknown breaks when used WithCast

[andrewcurioso]

When WithUnknown() was used with struct output and dynamic buckets, we didn’t track which keys were already handled by dynamic key rules. Those keys were incorrectly treated as unknown, and the code tried to put them into buckets again using the raw input instead of the validated value (e.g. from WithCast), causing a type/panic. We now track known keys whenever dynamic buckets are present, so only truly unknown keys go through the unknown path.”

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ca29942) to head (d992b6b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #49      +/-   ##
===========================================
+ Coverage   99.88%   100.00%   +0.11%     
===========================================
  Files          77        77              
  Lines        5129      5129              
===========================================
+ Hits         5123      5129       +6     
+ Misses          4         0       -4     
+ Partials        2         0       -2     

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