container: fix some binary search functions

[coletrammer]

Summary

Small fixes for binary search functions.

Check List

• Self-review the code
• Update tests if necessary
• Update docs if necessary

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.16%. Comparing base (ee1df14) to head (eb8873e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   94.16%   94.16%           
=======================================
  Files         598      598           
  Lines        9712     9712           
  Branches      616      616           
=======================================
  Hits         9145     9145           
  Misses        567      567           

Flag	Coverage Δ
Linux	94.16% <100.00%> (ø)

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