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+Skip the read-before-write step when a write covers an entire shard, eliminating an unnecessary `get` on full-shard overwrites with the sharding codec.
diff --git a/changes/3800.misc.md b/changes/3800.misc.md
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+Rename the `DimensionNames` type to `DimensionNamesLike` to reflect that it models the wide input type that is narrowed to the `dimension_names` attribute on V3 array metadata, matching the `XLike` naming convention used by other input-narrowing types.
diff --git a/changes/3863.bugfix.md b/changes/3863.bugfix.md
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+Fix handling of `NaT` default fill values for `datetime64` and `timedelta64` data types. Equality checks now use `numpy.isnat` so that the default fill value compares correctly against `NaT`.
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