Force saving of a hidden field

[turgs]

Similar to Issue 113, I'm trying to track the timestamp of when draft was last edited.

I can't find a way for garlicjs to do that for me, so I'm trying to roll my own in a hidden field, and have garlicjs save it just like any other field.

But hidden fields seem to be excluded. So I've tried to make it a normal text field, but with CSS "display:none", but it doesn't get saved because the user never gives the field focus.

Is there a way to overcome this type of scenario?