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NULL is OK, both for passing and for returning.
Parameter points to an array of items.
Default parameter value (in case a function which shadows this one via rename-to has fewer parameters).
Generics and defining elements of containers and arrays.
Parameter for returning results. Default is transfer full.
Out parameter, where callee must allocate storage.
The caller owns the data, and is responsible for free it.
The data is owned by the callee, which is responsible of freeing it.