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I think the point he was trying to make was that the example for @inbounds from the official documentation could cause out-of-bounds accesses, while it was clearly stated that you should only use @inbounds if you are sure that no out-of-bounds accesses are possible.

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The issue is that there is no way to verify if OOB access is possible given an abstract type, unless you know how that type behaves, i.e. how it's indexed.

And Julia provides no way of specifying the behaviour of abstract types.

> And Julia provides no way of specifying the behaviour of abstract types.

I'm not sure if "no way" is accurate. There are interfaces and one could use traits. As cited above, we could use `eachindex` or `CartesianIndices` to get a list of the valid indices. The problem is enforcing and testing these interfaces.

There are no interfaces in Julia. There is simply documentation, and the hope that people will read, understand, and follow it.

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