Defaults in form - note that only fields with form.skip get default when submitted with no value (empty input that becomes null, as in [DefOptMayBeNullEmptyIsNull])

Def *

Def Empty Is Null *this cannot be submitted empty, raises error and shows again with default filled

Def Opt(Optional)

Def Opt May Be Null(Optional)

Def Opt May Be Null Empty Is Null(Optional)here the default is not set if the input is empty so value is null

Def Opt Empty Is Null(Optional)