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E
Generics and defining elements of containers and arrays.
N
NULL may be passed as the value in, out, in-out; or as a return value.
O
NULL may be passed instead of a pointer to a location.
Parameter for returning results. Default is transfer full.
S
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.