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NULL is OK, both for passing and for returning.
Generics and defining elements of containers and arrays.
Parameter for input. Default is transfer none.
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 until first called.
The callback is valid only during the call to the method.
Exposed in C code, not necessarily available in other languages.
Free data container after the code is done.
Free data after the code is done.
Don't free data after the code is done.