There is a bug in in dask support in xarray version(s) prior to 0.21.0. 0.21.0 drops support for python 3.7. 0.20.2 has the bug. This commit tests if 0.20.1 does, too.

issue:  [preserve chunked data when creating DataArray from itself #5983](pydata/xarray#5983)
corresponding pull request:  [preserve chunked data when creating DataArray from DataArray #5984](pydata/xarray#5984)
released in 0.21.0:  [https://docs.xarray.dev/en/stable/whats-new.html#id81]

Author: jjpr-mit

setup.py

@@ -14,7 +14,7 @@
     "entrypoints",
     "numpy",
     "pandas",
-    "xarray!=2022.6.0,!=2022.9.0,!=2022.10.0",  # 6-10 have a groupby bug: https://github.com/pydata/xarray/issues/6836
+    "xarray!=0.20.2,!=2022.6.0,!=2022.9.0,!=2022.10.0",  # 6-10 have a groupby bug: https://github.com/pydata/xarray/issues/6836
     "netcdf4!=1.6.0",  # https://github.com/Unidata/netcdf4-python/issues/1175,
     "dask",
 ]