module ActiveModel::Attributes::ClassMethods

def attribute(name, cast_type = nil, default: NO_DEFAULT_PROVIDED, **options)
  name = name.to_s
  cast_type = Type.lookup(cast_type, **options) if Symbol === cast_type
  cast_type ||= attribute_types[name]
  self.attribute_types = attribute_types.merge(name => cast_type)
  define_default_attribute(name, default, cast_type)
  define_attribute_method(name)
end