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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.
Generics and defining elements of containers and arrays.
Parameter for input. Default is transfer none.
The callback is valid until the GDestroyNotify argument is called.
Free data container after the code is done.
Free data after the code is done.
Don't free data after the code is done.