Right now CI4 validation rules fail if the field is empty. So that they only work properly when the field is required. There should be a "nullable" rule to fix this problem. (I believe Laravel does this)
Otherwise null values should not fail validation by default.
See this post https://forum.codeigniter.com/thread-685...#pid352959
Otherwise null values should not fail validation by default.
See this post https://forum.codeigniter.com/thread-685...#pid352959