osobhandClaude Opus 5.5
d074385944
Layout message v4 flag bit 0 (H5D_CHUNK_DONT_FILTER_PARTIAL_CHUNKS, set with H5Pset_chunk_opts) makes libhdf5 store every chunk that extends past the dataset's extent without the filter pipeline, while its filter mask still reads 0. The parser ignored the flag, so readers tried to inflate raw bytes: libhdf5's own h5fc_edge_v3.h5 failed with "deflate: ... unknown compression method". DataLayout::Chunked gains dont_filter_partial_edge_chunks (always false for v3), and list_chunks — the one place every read path gets its chunk list from — marks such partial chunks as having skipped every filter, so the full, cached, indexed, parallel and selection readers all copy them as-is. chunked_write.rs gets `..` in one exhaustive test pattern for the new field. Regression: libhdf5_edge_chunk_fixture_reads (h5fc_edge_v3.h5 from the HDF5 tools test files, committed as a 2.5 KB fixture), and h5py_unfiltered_partial_edge_chunks_read (the flag set through h5py's bundled libhdf5 via ctypes, as h5py has no binding for it: fixed array, extensible array and B-tree v2 indexes, 1-D and 2-D, plus a hyperslab of the last chunk), and v4_chunked_dont_filter_partial_edge_chunks_flag. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>