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Does fileDatastore not implement "matlab.io.Datastore"?

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Eike Blechschmidt
Eike Blechschmidt on 26 Jul 2021
I'm currently developing a custom datastore that takes an existing datastore and adds some features.
In the constructor I would like to make sure that a passed argument is of type "matlab.io.Datastore" so I do:
assert(isa(ds, "matlab.io.Datastore"), ...)
This works fine for another custom datastore that directly implements "matlab.io.Datastore" but it does not work when das is created using
ds = fileDatastore(...)
fileDatastore. Form digging around in the source of "matlab.io.datastore.FileDatastore" I found out that it at some point implements "matlab.io.Datastore" but still above is not wokring. Am I missing somehting obvious?

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