osobhandClaude Opus 4.8 57adc88320 test: regression for scale-offset float E-scale (raw + masked filter) ...

The HDF5 library does not implement the scale-offset filter's floating-point
E-scale mode. When asked for it (cd_values[0] = 1) it stores the chunk raw
(no minbits/minval header) and sets the chunk filter mask to skip the filter,
so such datasets read back verbatim purely by honoring the per-chunk filter
mask — no E-scale decoder is required.

Add a fixture written via the HDF5 low-level API (exact-representable values)
and a test asserting it reads back verbatim, locking in the filter-mask path.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

2026-06-03 22:14:01 +00:00

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