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Steve,

... your code would start with an object header that contains
various pointers to other data structures within the object.


Please define what you mean by "pointer" in this context. You can certainly
store offsets in a user space, and still read those after a save / restore.

The fact that a "pointer" on our OS is more than an offset (unlike some
OSes) and includes tag bits is actually a good thing, from a security
standpoint.

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