I find that misleading, because they're not, and not everything being prohibited here is a null.
```
// That's not a null.
scala> def f[T <: Null](x: T): Int = x
<console>:7: error: an expression of type Null is ineligible for implicit conversion
       def f[T <: Null](x: T): Int = x
                                     ^
// That IS a null.
scala> def g: Seq[Int] = (null: Array[Int])
g: Seq[Int]
```