Q: should readonly fields be validated on blur?

### Are you submitting a **bug report** or a **feature request**?

*bug report**

### What is the current behavior?

field has `readonly` atribute set so user cannot change its value but if the prefilled value is incorrect, validation triggered on e.g. `blur` event raises error

### What is the expected behavior?

validation should not be triggered on `readonly` inputs for `blur` event

### Sandbox Link

### What's your environment?

RFF v6.59, FF 4.20.7

### Other information