[d-v-b]

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ArrayConfig.from_dict read only the keys it models and silently ignored the rest. Every entry point that takes an array config goes through it (create_array, create, open_array, Group.create_array, ...), so a misspelled key was accepted and had no effect:

zarr.create_array({}, shape=(4,), dtype="uint8", config={"write_empty_chunk": True})
# succeeds on main; write_empty_chunks is still False

Array.with_config builds the config with ArrayConfig(**...), and already raised TypeError for the same key, so the outcome depended on the entry point.

from_dict now raises:

TypeError: Unknown array config keys: ['write_empty_chunk']. Valid keys are ['order', 'write_empty_chunks', 'read_missing_chunks', 'sharding_coalesce_max_gap_bytes', 'sharding_coalesce_max_bytes'].

This is a behaviour change: code that passed extra keys in config now fails loudly instead of having them silently ignored.

The agent split this out of #4408, where routing config through the array constructor exposed it.

Tests

• test_array_config_from_dict: partial and full dicts take the given keys and fill the rest from the global configuration.
• test_array_config_unknown_key: the one error case, through from_dict, create_array and create. All three fail on main.

The full test suite passes locally, and so does mypy.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.37%. Comparing base (f58644a) to head (5785153).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4414   +/-   ##
=======================================
  Coverage   94.37%   94.37%           
=======================================
  Files          93       93           
  Lines       13171    13174    +3     
=======================================
+ Hits        12430    12433    +3     
  Misses        741      741           

Files with missing lines	Coverage Δ
src/zarr/core/array_spec.py	100.00% <100.00%> (ø)

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