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Currently navigator providers are registered according to DataObject subclass name, it seems. This is an undesirable dependency on impl details of the Java module (for example). Better to register the provider either 1. In default lookup, with some filter. But could cause overeager instantiation of providers. 2. [Preferred] In the layer, with a path named acc. to file MIME type, e.g. ".../text/x-java/...".
Will implement in post 4.1 release.
Uh, isn't this already FIXED in 4.2?
Yes, it is.