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osobhandClaude Opus 5.5 b55768ff76 chunked writer: chunks of 4 GiB or more never use the v1 B-tree; need high bound V200
Stacking feat/libver-v18 under feat/huge-chunks sent every chunked dataset
of a file with a 1.8 low bound to a version-1 B-tree, whose key holds a
32-bit chunk size. As in libhdf5, such a chunk now takes layout version 5
whatever the low bound, and a high bound below 2.0 is FormatError::LibverBound.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
2026-09-28 23:46:04 -05:00
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