Insert modifies other inputs state

[maciejmyslinski]

Are you submitting a bug report or a feature request?

bug report

What is the current behavior?

We have an array of fruits.
Initial values are: ['']

Steps to reproduce:

1. Click insert(0, 'apple') button.

The input of index 1 (the last one) have pristine: true state even though it was never touched.

What is the expected behavior?

The input of index 1 (the last one) should have pristine: false since it was never touched.

Sandbox Link

What's your environment?

package	version
final-form	4.11
react-final-form	4.0.2
final-form-arrays	1.1.1
react-final-form-arrays	2.0.1

Other information

[erikras]

This is not a bug for the same reason as #23 (comment).

If you initialize the value to { fruits: [ undefined ] }, it works as expected.