Re: [netcdfgroup] Bad file ??

I think the issue is that the _FillValue of "NaN" is probably a float64
while the variable's dtype is float32, which is probably what it means by a
type mismatch. When I have a NaN FillValue for a float32 variable, it
prints "NaNf"

```
float sum_tp_mm(time, latitude, longitude) ;
   sum_tp_mm:_FillValue = NaNf ;
```