simplify chunks_vectored implementation

[sunshowers]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.18%. Comparing base (cda51bc) to head (5289e71).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cursor/tests.rs	68.75%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   82.68%   84.18%   +1.50%     
==========================================
  Files           7        6       -1     
  Lines         693      803     +110     
==========================================
+ Hits          573      676     +103     
- Misses        120      127       +7     

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