How should you get the array from the user and then store it in the changeset,
let’s say the array should contain numbers, so do I need to display an input field that contains the list of numbers join-ed using javascript (e.g. by comma), or is there a better way?
What exactly are you trying to achieve?
If you just want an input for entering multiple numbers, you could use a textarea which will give you all numbers separated by \n.
Or you could generate multiple inputs with a form[field][] name and then the browser will concatenate all this values into a list for you.
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