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There is such a thing as a rank-0 MTensor. It's mentioned here. Can we pass such an object to a LibraryFunction? How?

This question is mostly out of curiosity, and not practical need. But it might solve this:

What I tried:

It is possible to LibraryFunctionLoad a function with an argument type of {Integer, 0, "Shared"}. It is possible to load the function like this. But when trying to pass an integer to it, i.e. simply a = 1, then fun[a] instead of a = {1} then fun[a], it gives an error:

LibraryFunction::cfsa: Argument 1 at position 2 should be a machine-size integer.

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