In our experience, single-element tuples are just never used in practice. There has been some discussion on how to add syntax for them, but I think it's more of a desire for orthogonality than for a practical need.

Yeah I can't imagine any scenario where it's not just a value or an array of values that happens to have only one value right now.

Now I am curious what {number, string, number} would be considered as.

it's a three element tuple.

That was my guess, just as {n, n, n, n} would be a four element tuple, right?