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NULL is ok, both for passing and for returning.
Parameter points to an array of items.
Generics and defining elements of containers and arrays.
Parameter for returning results. Default is transfer full.
Out parameter, where caller must allocate storage.
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 after the code is done.
Don't free data after the code is done.