fix: update not applying zero value checks

[jmattheis]

Fixes #221

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.95%. Comparing base (e5e4ffd) to head (f64844e).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #222   +/-   ##
=======================================
  Coverage   95.95%   95.95%           
=======================================
  Files          50       50           
  Lines        2743     2743           
=======================================
  Hits         2632     2632           
  Misses         80       80           
  Partials       31       31           

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