"I have to admit that I do not understand the semantics of missing_value."
As I understand it, the value of missing_value is supposed to be used when the submitted form-field is empty. As opposed to default_value, which is supposed to pre-populate the form field.
"I have to admit that I do not understand the semantics of missing_value."
As I understand it, the value of missing_value is supposed to be used when the submitted form-field is empty. As opposed to default_value, which is supposed to pre-populate the form field.