Unnecessary None provided as default

[DimitriPapadopoulos]

TODO:

• Unit tests and/or doctests in docstrings
• Tests pass locally
• Docstrings and API docs for any new/modified user-facing classes and functions
• Changes documented in docs/release.rst
• Docs build locally
• GitHub Actions CI passes
• Test coverage to 100% (Codecov passes)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.96%. Comparing base (65e16c3) to head (4e3c467).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #708   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          63       63           
  Lines        2736     2736           
=======================================
  Hits         2735     2735           
  Misses          1        1           

Files with missing lines	Coverage Δ
numcodecs/zarr3.py	99.50% <100.00%> (ø)

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