Fix accidental piracy in BufferedVector

[Drvi]

Fixes #94

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.92%. Comparing base (fa840f9) to head (8ee21d4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   94.82%   94.92%   +0.10%     
==========================================
  Files           5        5              
  Lines        1043     1044       +1     
==========================================
+ Hits          989      991       +2     
+ Misses         54       53       -1     

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