Dear devs,

In an AddOn-project we are generating many small temporary maps that usually 
fit into memory all together without problems.
In order to avoid disk IO we tried to use r.external.out with format=MEM.
With the memory driver, maps are created and visible in the data catalog, but 
it is not possible to read them as there is no file stored in the directory 
specified in r.external.out.
Is it feasible to make it work, or should we consider it a known limitation?

Cheers
Stefan
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