For convenience, here is the proposal for specifying the precision to be used 
for the interpolation calculations (slightly robustified):

* By default, the user may use any precision they like for the interpolation 
calculatins, but if the `interpolation_precision` attribute has been set to a 
numerical value then the precision should match the precision of the given 
numerical value.
 

```
// Interpolation variable with NO 'interpolation_precision' attribute
// => the creator is saying "you can use whatever precision you like when 
uncompressing" 
char interp ;
    interp:interpolation_name = "bi_linear" ;
```

```
// Interpolation variable with 'interpolation_precision' attribute
// => the creator is saying "you must use the precision I have specified when 
uncompressing"
char interp ;
    interp:interpolation_name = "bi_linear" ;
    interp:interpolation_precision = 0D ;  // use double precision when 
uncompressing
```

Do you think that this might work, @taylor13?

Thanks,
David


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