Generics and defining elements of containers and arrays.
Parameter for returning results. Default is transfer full.
Out parameter, where caller must allocate storage.
The callback is valid until first called.
The callback is valid only during the call to the method.
Exposed in C code, not necessarily available in other languages.
The intention of a Stable interface is to enable arbitrary third parties to
develop applications to these interfaces, release them, and have confidence that
they will run on all minor releases of the product (after the one in which the
interface was introduced, and within the same major release). Even at a major
release, incompatible changes are expected to be rare, and to have strong