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NULL is ok, both for passing and for returning.
Don't free data after the code is done.
Out parameter, where caller must allocate storage.
Parameter for input and for returning results. Default is transfer full.
Generics and defining elements of containers and arrays.
Parameter for returning results. Default is transfer full.
Free data after the code is done.
The callback is valid until first called.
Free data container after the code is done.