Swift 3, Xcode 8β2.  

I've implemented a class that sorts Comparable data and attempted to test it using Doubles. Unfortunately, I'm getting the error `"Cannot convert value of type '[Double]' to specified type '[T]'."`. I've reproduced the error in the sample code below:

```
class foo<T: Comparable> {
    let data: [T]  = [Double]()
}

```

Am I right is assuming that Doubles are Comparable and, if so, how do I eliminate the error above?  

Thx.