Incredible bug in v2.0.0

v2.0.0 has an obvious regression, that I'm surprised made it into the release.

Given a form with multiple simple text inputs:
* typing a character into an input automatically switches the focus to the next input (this repeats every time a character is typed into an input)
* if there is an input with an error, typing a character into any other input automatically switches the focus to the input with the error (I thought this is supposed to happen only after the form is submitted...)

How this made it in is beyond me.

Start by reproducing the regression in v2.0.0 with a form containing multiple simple text inputs and an input with an error. Trace the focus behavior while typing and after submission, then verify that typing does not move focus and that the first errored field receives focus only after an attempted submission.

Written by the indexing model from the issue text.