issues: 2019594436

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
2019594436 I_kwDOAMm_X854YJDE 8496 Dataset.dims should return a set, not a dict of sizes 35968931 open 0     8 2023-11-30T22:12:37Z 2023-12-02T03:10:14Z   MEMBER      

What is your issue?

This is inconsistent:

```python In [25]: ds Out[25]: <xarray.Dataset> Dimensions: (x: 1, y: 2) Dimensions without coordinates: x, y Data variables: a (x, y) int64 0 1

In [26]: ds['a'].dims Out[26]: ('x', 'y')

In [27]: ds['a'].sizes Out[27]: Frozen({'x': 1, 'y': 2})

In [28]: ds.dims Out[28]: Frozen({'x': 1, 'y': 2})

In [29]: ds.sizes Out[29]: Frozen({'x': 1, 'y': 2}) ```

Surely ds.dims should return something like a Frozenset({'x', 'y'})? (because dimension order is meaningless when you have multiple arrays underneath - see https://github.com/pydata/xarray/issues/8498)

 
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