Remove `.class` call. 

When you do something like this:

```ruby
case obj
  when choice then ...
end
```

Ruby executes something similar to `choice === obj` (note triple equals) for each alternative and selects the first one that returns `true`.

Since [`Module#===`](http://www.ruby-doc.org/core-1.9.3/Module.html#method-i-3D-3D-3D) checks if the passed object is an instance of the module itself, you can do things like:

```ruby
case obj
  when KlassA then ...
  when KlassB then ...
end
```