This PR avoids some ambiguity issues for the upcoming CommonDataModel 0.3.
(In the new version of CommonDataModel 0.3, one can access variables also by standard name, e.g.
ds[CF"longitude"] will be a variable whose standard name is "longitude". CF"longitude" will have the type CommonDataModel.CFStdName and we need to dispatch on that)
This PR avoids some ambiguity issues for the upcoming CommonDataModel 0.3.
(In the new version of CommonDataModel 0.3, one can access variables also by standard name, e.g.
ds[CF"longitude"]
will be a variable whose standard name is "longitude". CF"longitude" will have the type CommonDataModel.CFStdName and we need to dispatch on that)