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Instances can support any subset of Iris functions. It is possible to check whether a function or a set of functions is supported by a specific instance. It is also possible to get a list of all functions that are supported by a specific instance.
It is not mandatory to check whether a function is supported before
calling it. Functions that are not supported by an instance return
discovery is mandatory for all instances. In other words,
instance_getFunctionInfo() must not return