```ruby
# -*- encoding: utf-8 -*-

require 'data_mapper/validation/rule'

module DataMapper
  module Validation
    class Rule

      class PrimitiveType < Rule

        def valid?(resource)
          property = get_resource_property(resource, attribute_name)
          value    = resource.validation_property_value(attribute_name)

          # FIXME: Deprecation message said Property#valid? was replaced 
          # with Property#value_dumped? but IMHO value_loaded? would be correct here?
          value.nil? || property.value_dumped?(value)
        end

        def violation_type(resource)
          :primitive
        end

        def violation_data(resource)
          property = get_resource_property(resource, attribute_name)

          [ [ :primitive, property.load_as ] ]
        end

      end # class PrimitiveType

    end # class Rule
  end # module Validation
end # module DataMapper
```

Remove FIXME from primitive type validation
user
```ruby
# -*- encoding: utf-8 -*-

require 'data_mapper/validation/rule'

module DataMapper
  module Validation
    class Rule

      class PrimitiveType < Rule

        def valid?(resource)
          property = get_resource_property(resource, attribute_name)
          value    = resource.validation_property_value(attribute_name)

          value.nil? || property.value_dumped?(value)
        end

        def violation_type(resource)
          :primitive
        end

        def violation_data(resource)
          property = get_resource_property(resource, attribute_name)

          [ [ :primitive, property.load_as ] ]
        end

      end # class PrimitiveType

    end # class Rule
  end # module Validation
end # module DataMapper
```
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