@martinjuckes - This issue started with the need to clarify the CF definition of "coordinate variable" because it says "precisely as it is defined in the NUG" and a `string` type was added with netCDF-4. The `char x(x,l)` form has long been part of the NUG definition so it wasn't clear to me that CF was restricting all "coordinate variables" to be numeric-valued. And its still not clear to me why CF would restrict them to numeric.
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