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Parameter points to an array of items.
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.
Out parameter, where caller must allocate storage.
Exposed in C code, not necessarily available in other languages.
The caller owns the data container, but not the data inside it.
The caller owns the data, and is responsible for free it.