How do you create an immutable array in Swift?

Question

How do I create an immutable array in Swift?

A superficial reading of the docs would suggest you can just do

let myArray = [1,2,3]

Answer 1

It is now possible.

From Apple Developer

If you assign an array or a dictionary to a constant, that array or dictionary is immutable, and its size and contents cannot be changed.

So now

let myArray = [1,2,3]

produces completely immutable array. Yay!