Fix and improve undocumented onDataArrayChange

[radubrehar]

onDataArrayChange is not documented yet, but it's in the TS typings.

Before we expose it, we should fix the following issues:

• onDataArrayChange is called on the first render - see console https://codesandbox.io/s/ondataarraychange-called-first-render-vpg2tx?file=/App.tsx

• usage with controlled data https://codesandbox.io/s/ondataarraychange-called-first-render-forked-6tsnsc?file=/App.tsx