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NULL is OK, both for passing and for returning.
Generics and defining elements of containers and arrays.
NULL may be passed as the value in, out, in-out; or as a return value.
Parameter for returning results. Default is transfer full.
The callback is valid only during the call to the method.
Free data container after the code is done.
Free data after the code is done.
Don't free data after the code is done.