Getting & setting argument data for ProcedureConfig (Python, and possibly others)

Applications
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Getting

Non-Image or non-drawable arguments are passed in a ProcedureConfig object but what is passed isn’t a plain Procedureconfig, from Python the type is <__gi__.ProcedureConfig{name-of-procedure}>.

Obtaining an argument value from that appears to be done with config.get_properties(argname) but I can’t find a description of that get_properties() method, I only see get_property() in the docs (GObject). Furthermore, what is returned by this method appears to always be an array?

Setting

I assume that returning values to a caller is done by setting values in the ProcedureConfig object, using names declared by an add_{type}_return_value(...) when creating the procedure? If so what is the API?

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