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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.
Out parameter, where callee must allocate storage.
The callback is valid until first called.
Free data after the code is done.
Don't free data after the code is done.