[gdal-dev] unsetting configs vs empty values

[Even Rouault]

Mike,

>
> Homework for me for this question was to see if other options behave 
> this way in terms of "default", and I didn't get to that today.

The more reliable way is unset an option is through the API with 
CPLSetConfigOption(option_name, NULL).

Setting an empty string will *sometimes* have a similar effect, but I'm 
pretty sure there are some options where NULL vs empty string will lead 
to different behaviors.

Even

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