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WIP for #118

@jeromekelleher jeromekelleher marked this pull request as ready for review January 20, 2026 09:42
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codecov-commenter commented Jan 20, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.88%. Comparing base (6407cc1) to head (290a545).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files
@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
- Coverage   97.32%   96.88%   -0.45%     
==========================================
  Files           6        7       +1     
  Lines         337      385      +48     
  Branches       56       62       +6     
==========================================
+ Hits          328      373      +45     
- Misses          7        8       +1     
- Partials        2        4       +2     
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@jeromekelleher jeromekelleher force-pushed the add-1D-chunking branch 2 times, most recently from fe22945 to 36aa743 Compare January 20, 2026 11:42
@jeromekelleher jeromekelleher force-pushed the add-1D-chunking branch 2 times, most recently from 5b67175 to 041ed42 Compare January 20, 2026 12:02
Also switch to 32MiB chunks

Closes tskit-dev#69
Closes tskit-dev#118
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I think this is ready to go in once we've validated that it actually does fix compression on very large files. I don't have an example lying around handy (raw sc2ts output triggers this, which is what's motivated me to do it!)

I checked in terms of compression performance on the final sc2ts output, and the files are very slightly larger. It's not worth worrying about.

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