don't typecast if it's not an Attribute

lib/friendly/document/attributes.rb

@@ -34,7 +34,7 @@ def assign_default_values
       end
 
       def assign(name, value)
-        send(:"#{name}=", self.class.attributes[name.to_sym].typecast(value))
+        send(:"#{name}=", typecast(name, value))
       end
 
       protected
@@ -43,6 +43,11 @@ def assert_no_duplicate_keys(hash)
             raise ArgumentError, "Duplicate keys: #{hash.inspect}"
           end
         end
+
+        def typecast(name, value)
+          attribute = self.class.attributes[name.to_sym]
+          attribute ? attribute.typecast(value) : value
+        end
     end
   end
 end

spec/unit/document/attributes_spec.rb

@@ -76,5 +76,12 @@
       @object.assign(:id, uuid.to_guid)
       @object.id.should == uuid
     end
+
+    it "doesn't try to typecast if there's no Attribute object" do
+      @klass.send(:attr_accessor, :height)
+      @object        = @klass.new
+      @object.assign(:height, "5'11")
+      @object.height.should == "5'11"
+    end
   end
 end