Does fileDatastore not implement ""?

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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 "" so I do:
assert(isa(ds, ""), ...)
This works fine for another custom datastore that directly implements "" but it does not work when das is created using
ds = fileDatastore(...)
fileDatastore. Form digging around in the source of "" I found out that it at some point implements "" but still above is not wokring. Am I missing somehting obvious?

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