[up-validate] on input[type=date] should run callback on blur event, not change event

[triskweline]

Discussed in #334

^{Originally posted by sturatcliffe December 16, 2021}
Hi all,

Has anyone else noticed some weird behaviour when using up-validate on a HTML date field? I've only checked in Chrome so far, but when you try to enter a date, it seems to trigger the validation request when entering the first character of the year part.

This means you end up not being able to complete the year part as when the validate request resolves and the form is re-rendered, the focus on the date field resets so you end up in an infinite loop of entering the day + month + first digit of the year.

Hopefully this GIF helps demonstrate it!

Has anyone found a way of stopping this behaviour so we can have Unpoly trigger validation on date/datetime fields?

Cheers.