[Don-Yin]

Fixes #4553.

Some Numcodecs filters (e.g. PackBits) return a flat array, so a following TransposeCodec fails on write. This reshapes the encoded output to the shape from resolve_metadata.

Reshaping alone isn't enough: after undoing the transpose the array can be F-ordered, and Numcodecs decodes in memory order, so Delta and FixedScaleOffset round-trips come back scrambled. Making the input C-contiguous before decoding fixes that.

Builds on @ghuls's draft in the issue. The existing filter round-trip test now also runs with a following transpose.

• I am a human, these are my changes, and I have reviewed and understood every change and can explain why each is correct.

TODO

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions (n/a)
• New/modified features documented in docs/user-guide/*.md (n/a)
• Changes documented as a new file in changes/
• GitHub Actions have all passed
• Test coverage is 100% (Codecov passes)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.71%. Comparing base (957a5f6) to head (b825666).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4558   +/-   ##
=======================================
  Coverage   94.71%   94.71%           
=======================================
  Files          94       94           
  Lines       13663    13664    +1     
=======================================
+ Hits        12941    12942    +1     
  Misses        722      722           

Files with missing lines	Coverage Δ
src/zarr/codecs/numcodecs/_codecs.py	95.50% <100.00%> (+0.02%)	⬆️

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[ghuls]

Thanks for fixing it properly.