The _FillValue CF property.
This property is forced to be consistent with the missing_value property as follows:
- Assigning a value to missing_value also assigns the same value to the _FillValue whether the latter has been previously set or not.
- Assigning a value to _FillValue also assigns the same value to missing_value, but only if the latter has previously been defined.
Examples
>>> f._FillValue = -1e30