Steps to reproduce the issue

Hi
I don't know bug it or feature request

Open any detail item for edit, ie from list to detail view form. In form definition one item is set readonly

Update your database record, set your item to some value

Save your form

Expected result

Your readonly item should not be updated

Actual result

Your readonly item is updated to your value in form

System information (as much as possible)

Joomla 3.10.11
I developing my extension, and noticed, that all fields in form definition (XML), are used in Update DML clause.
I didn't analyze Joomla code for it, but it is easy to reproduce

Additional comments

I expected that read only fields in form are not used in Update SQL clause.

Probably there is some attribute to do that.
It is useful (in my opinion), and it will be good to have it in J3 and J4