solnic/virtus — pull request #233 by codesnik (2013-12-19 05:31:38+00:00)
Title: Improve value_object's #hash uniformity

Array#hash is designed to be uniform, unlike reduce(:^).hash

```ruby
class Point
include Virtus.value_object
values do
attribute :x, Integer
attribute :y, Integer
end
end

Point.new(x: 1, y: 1).hash == Point.new.hash # was true
Point.new(x: 1).hash == Point.new(y: 1).hash # was true
```