As I understand it this was a multilingual exercise. In some languages "mixed type values" isn't a thing so you can't test it and your users can't get it wrong.
Likewise for non-arrays.
It's notable that one of the participants had decided empty arrays shouldn't be a thing, so far as I know programming languages all admit the idea of the empty array although perhaps some of them don't distinguish between empty arrays and various other empty data structures.
Likewise for non-arrays.
It's notable that one of the participants had decided empty arrays shouldn't be a thing, so far as I know programming languages all admit the idea of the empty array although perhaps some of them don't distinguish between empty arrays and various other empty data structures.