add flag_values to convert to datatype (bytes in this case)

Author: mphemming

aodntools/ncwriter/template.py

@@ -298,7 +298,7 @@ def create_variables(self, **kwargs):
 
         # variable attributes to convert to the same type as the variable
         # datatype
-        varattrs_to_convert_to_datatype = ['valid_min', 'valid_max', 'valid_range']
+        varattrs_to_convert_to_datatype = ['valid_min', 'valid_max', 'valid_range', 'flag_values']
 
         for varname, varattr in self.variables.items():
             if not varattr['_dimensions']:  # no kwargs in createVariable

setup.py

@@ -5,7 +5,7 @@
     'numpy>=2.2.4',
     'netCDF4>=1.7.2',
     'pandas>=2.2.3',
-    'xarray>=2023.1.0'
+    'xarray>=2023.1.0,xarray<=2025.3.1'
 ]
 
 TESTS_REQUIRE = [