Add IVCSC/IVCSR file storage format and default Blosc2+LZ4 compression - #2
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VCSCAnnData.write_h5ad/write_zarr gain format="ivcsc", which byte-packs the minor-axis indices (delta+varint) for a smaller file; reading always decompresses straight back into a plain VCSCArray/VCSRArray, so IVCSC is purely an on-disk storage format with no separate in-memory type. Both write methods also now default to Blosc2+LZ4 compression for every array (override via dataset_kwargs). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016hqRfanyt3BKX8GsNPSdK2
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Summary
VCSCAnnData.write_h5ad/write_zarracceptformat="ivcsc", which delta+varint byte-packs the minor-axisindicesarray for a smaller file. This is storage-only — reading a file (viaread_h5ad/read_zarr, oranndata.io.read_elemanywhere in the registry) always decompresses straight back into an ordinaryVCSCArray/VCSRArray; there is no separate in-memory IVCSC type.write_h5ad/write_zarrto Blosc2+LZ4 compression for every array written (viahdf5pluginfor HDF5, zarr's native Blosc codec for zarr), overridable viadataset_kwargs.Test plan
uv run pytest(336 passed, 10 skipped)uv run ruff check .uv run ty checkuv run sphinx-build -b html docs docs/_build/htmlhttps://claude.ai/code/session_016hqRfanyt3BKX8GsNPSdK2