fix: prevent UB with compile-time check when bucket size = 1

[sdd]

Fixes: #295

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.02%. Comparing base (586cf22) to head (8fc1c0c).
⚠️ Report is 1 commits behind head on v5.x.x.

Additional details and impacted files

@@           Coverage Diff           @@
##           v5.x.x     #300   +/-   ##
=======================================
  Coverage   95.02%   95.02%           
=======================================
  Files          54       54           
  Lines        6452     6454    +2     
  Branches     6452     6454    +2     
=======================================
+ Hits         6131     6133    +2     
  Misses        291      291           
  Partials       30       30           

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