I'm not sure that the default value of wedge belongs here, but if you look at how I'm handling global level styles such as
```ruby
Shoes.app do
  wedge true
  arc . . . 
end
```

Then it *could* be very convenient to just stick anything with a logical default in here. Then again, it might be overkill and I should just stick special defaults like wedge with the class definition (this is where `@wedge ||= false` is sitting on master).

Thoughts?