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A note on "?" operator and indirect projectsprojections

This is really only the beginning of a compatibility story, there is more to come (e.g. "null-default inline types"). Today it is a stop gap measure to enable use of current generics, until we get real generic specialization in place. New code should avoid indirect "?" like the plague and only use it for interfacing with code that must deal with "null" (e.g. current generics with type erasure). A good performance story does not exist for indirect, and it is not likely to improve too much in the future.

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