issue_comments: 708588777

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https://github.com/pydata/xarray/issues/4501#issuecomment-708588777 https://api.github.com/repos/pydata/xarray/issues/4501 708588777 MDEyOklzc3VlQ29tbWVudDcwODU4ODc3Nw== 1217238 2020-10-14T18:41:21Z 2020-10-14T18:41:32Z MEMBER

If we changed isel() to only modify data variables, then we would be in trouble with something like isel(x=slice(3)). The coordinate system would be inconsistent if we slice only the data variables but not the coordinates.

There's a bit of a conflict here between two desirable properties:

  1. Methods on a Dataset only modify data variables, leaving coordinates unchanged
  2. Methods on a Dataset keep the entire coordinate system for the Dataset consistent, including coordinates
 
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