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Thanks. That's a good link. The proposal is a good start, although a bit lacking on the concrete design for a new API. I'm not sure there's a big need for innovation here though: JNI basically got it right. It provides full isolation from VM implementation details (especially of memory management) while not sacrificing performance or completeness. JNI has a bad reputation for some reason I've never fully understood, but it seems like an elegant approach to me.