Contributors mailing list archives
Re: Migration to Odoo 14: replacing size attribute of Char fieldby
Tecnativa. S. L., Pedro M. Baeza
If I don't remember bad, there's a warning logged saying the size is deprecated, and that's why it's included in the migration guide.
I think the alternative is to put it on the view, not on the field.
AGILE BUSINESS GROUP SAGL, Simone Rubino