Vendor internal imports from xarray.core in xarray.py #1079
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As suggested in #1077, this PR vendors
either_dict_or_kwargs
,expanded_indexer
, andis_dict_like
, which are used inmetpy/xarray.py
, instead of using them from the internal API ofxarray.core
(DatasetAccessor
is handled in #1078).This is the first time I've tried vendoring code like this, so please do let me know if this is the right approach to take or if the code and/or license should be included elsewhere. Also, should I add tests of the vendored functions?