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Zig and Rust also support array slices. But they can’t be null, because that’s - as the article says - a mistake.

Other languages avoid the mistake by preventing direct access unless either there is a null check or they are declared as non nullable.

D slices can be null, but they're not a mistake, as the runtime will not let you read/write a 0 length array.

What's the relation between a null slice and a 0-length array?

Neither can be successfully indexed.

Perhaps this is similar to how they work in go?

"var x []int; fmt.Printf(`%p %d`, x, len(x))" outputs "0x0 0"

Indexing "x[0]" results in: "panic: runtime error: index out of range [0] with length 0"

They can also be appended to and then produce a valid slice.