[ThomasWaldmann]

Invalid buzhash chunker params, for example 10,12,11,4095, passed argument validation. They then crashed the buzhash Chunker with AssertionError: too small max_size (see the assertion in chunkers/buzhash.pyx).

The buzhash64 params branch already rejects such params, using window_size + 2^chunk_min + 1 <= 2^chunk_max. This PR applies the same check to the plain buzhash branch, including the old-style 4-number compat form. Such params now give a normal argument error (rc 2):

error: argument --chunker-params: required: window_size + 2^chunk_min + 1 <= 2^chunk_max

These params always crashed, so no working setup gets rejected. Tests cover two rejected cases and the exact boundary 10,13,11,4095, which is still accepted.

1.4-maint backport: #10596

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.37%. Comparing base (184cae0) to head (d21017e).
⚠️ Report is 8 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10597      +/-   ##
==========================================
+ Coverage   89.35%   89.37%   +0.01%     
==========================================
  Files         104      105       +1     
  Lines       20091    20335     +244     
  Branches     3154     3192      +38     
==========================================
+ Hits        17953    18175     +222     
- Misses       1481     1501      +20     
- Partials      657      659       +2     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.