fix: make validateAllFields more stable

[crutchcorn]

This PR closes #521 by making validateSync better at actually returning when it should trigger validateAsync internally. This makes our validation logic substantially more stable

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.64%. Comparing base (c2f9957) to head (091cfb8).
Report is 472 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
+ Coverage   84.55%   91.64%   +7.08%     
==========================================
  Files           9       21      +12     
  Lines         395      670     +275     
  Branches      109      185      +76     
==========================================
+ Hits          334      614     +280     
+ Misses         52       49       -3     
+ Partials        9        7       -2     

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