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Zero-fill block_starts instead of leaving unstored slots undef - #250
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dlfivefifty merged 1 commit intoSep 28, 2026
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For a BlockSkylineMatrix with ragged block bandwidths, block_starts is a BandedMatrix with bandwidths (maximum(l), maximum(u)), so it has in-band slots for blocks that a narrower column does not store. These were allocated undef and never written, so reading them gave garbage. They now read as 0, like the out-of-band entries. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #250 +/- ##
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Coverage 90.45% 90.45%
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Files 11 11
Lines 1142 1142
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Hits 1033 1033
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For a BlockSkylineMatrix with ragged block bandwidths, block_starts is a BandedMatrix with bandwidths (maximum(l), maximum(u)), so it has in-band slots for blocks that a narrower column does not store. These were allocated undef and never written, so reading them gave garbage. They now read as 0, like the out-of-band entries.
This is required for a more correct version of #234
I'm not seeing any performance regression on my machine.
Assisted-by: Claude Code (Opus 5.5)