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
1901520970,PR_kwDOAMm_X85amcNE,8203,Add T_DuckArray type hint to Variable.data,14371165,closed,0,,,3,2023-09-18T18:33:50Z,2023-09-19T17:41:28Z,2023-09-19T15:23:25Z,MEMBER,,0,pydata/xarray/pulls/8203,"The typing of Variable.data has been the very wide `Variable.data: Any` because of the difficulties defining the typing of a duckarray. 

This has led to confusion in downstream functions that uses `.data`. Sometimes arguments uses Any, np.typing.ArrayLike,  np.ndarray or dask array typing which is unnecessarily narrow when xarray also supports for example sparse arrays or cupy arrays.

This PR is a start at cleaning this up by defining a T_DuckArray typevar that symbolizes an array api compliant array. 
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