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@dfyx noticed that there is no way to add new fields in JS without using buttons.
Here is my implementation (may not work yet on edge cases) with an API:
Example of form code can be found here: https://github.com/kirs/activeform/blob/e9375a9d6fac5e0e9ff893dc30e22e2e8bb112dd/test/dummy/app/views/assignments/_form.html.erb