Sorry for the confusion. Configuration of the output format is a planned feature, but not yet part of this releases. Looks like the documentation was faster than the implementation.
For the moment, the data is always returned as a json object. For simple data types this consists of type and value. For complex types, the data object is returned directly as json.
For the planned feature we will make it configurable to return JSON (with type info), value only (as string), binary format (with type info, probably encoded as flatbuffer).
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