This isn't a terribly easy fix and will need some discussion.

Under the hood the data gets serialized and passed to Android to manage the loaders and activity state. Right now the loaders are hard coded to do JSON serialization.

At the easy but needs documentation end we can discuss requiring things which use LoaderPipes have Parcelable datatypes.
A bit more complex would be to beef our our request build and response handler classes so they can marshall and unmarshall objects into whatever format is necessary.
At the really complex end is we punt this to 2.0 and rethink the loaders.

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