Cast array of numbers to array of integers

[Lumbe]

How can I cast attribute that is array of integers?

E.g.

["1", "2", "3"] to [1, 2, 3]

[rubenvanassche]

Well you've got two options:

A) write a custom cast which changes the strings to ints
B) write a custom from method which changes the array before it is given to the data object