Checkboxes with-vmodel emit the empty value symbol when the unchecked value is undefined

[logaretm]

Discussed in #3422

^{Originally posted by 3Gorec July 28, 2021}
Is your feature request related to a problem? Please describe.
I want to validate checkboxes with rules and v-model. How can I do it? Documentation only provides example with validation schema.
If I validate without v-model I have to obtain values from checkboxes different way.
By the way how can I use validation schema with rules without yup?

The expected behavior is they would still emit undefined.