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Parameter points to an array of items.
This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.
NULL may be passed as the value in, out, in-out; or as a return value.
NULL may be passed instead of a pointer to a location.
Parameter for returning results. Default is transfer full.
Out parameter, where caller must allocate storage.
The callback is valid only during the call to the method.
Free data after the code is done.