fix: use where bounds on structs and enums

[jbr]

closes: #105

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.35%. Comparing base (41c0286) to head (58d9d75).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #106      +/-   ##
==========================================
+ Coverage   81.26%   81.35%   +0.08%     
==========================================
  Files          31       31              
  Lines        2189     2199      +10     
  Branches     2189     2199      +10     
==========================================
+ Hits         1779     1789      +10     
  Misses        320      320              
  Partials       90       90              

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