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A
NULL is OK, both for passing and for returning.
Parameter points to an array of items.
E
Generics and defining elements of containers and arrays.
R
Rename the original symbol's name to SYMBOL.
S
The callback is valid only during the call to the method.
Exposed in C code, not necessarily available in other languages.
T
Free data after the code is done.
Don't free data after the code is done.