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NULL is OK, both for passing and for returning.
Parameter points to an array of items.
This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.
Typed errors. Similar to throws in Java.
Parameter for input. Default is transfer none.
Parameter for input and for returning results. Default is transfer full.
Parameter for returning results. Default is transfer full.
The callback is valid until first called.
Free data after the code is done.
Don't free data after the code is done.