Fix NcML DataType conversion in old NetcdfDataset API#1559
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When using NcML to redefine coordinate variable type, the old NetcdfDataset API was falling back to the original variable datatype. This behavior seems to be OK in the old API datapath as long as the old and new data types are consistently numeric (or not), as enhancements will "do the rigth thing", but otherwise not (e.g. int to String conversion using NcML). Fixes Unidata#1540.
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Description of Changes
When using NcML to redefine coordinate variable type, the old NetcdfDataset API was falling back to the original variable datatype. This behavior seems to be OK in the old API datapath as long as the old and new data types are consistently numeric (or not), as enhancements will "do the rigth thing", but otherwise not (e.g. int to String conversion using NcML). Fixes #1540.
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