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A
NULL is OK, both for passing and for returning.
Parameter points to an array of items.
C
This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.
E
Generics and defining elements of containers and arrays.
O
Parameter for returning results. Default is transfer full.
S
The callback is valid only during the call to the method.
T
Free data container after the code is done.
Free data after the code is done.
Don't free data after the code is done.