use Outrun.Core.Boolean
use LogicalNot

```doc
# Boolean

Provides a common interface for values masquerading as Booleans.
```
protocol Boolean, as: do
  ```doc
  A mechanism for values to convert themselves into a concrete boolean value.

  Must be implemented.
  ```
  def true?(self: Self): Outrun.Core.Boolean

  ```doc
  Is the value false?
  ```
  def false?(self: Self): Outrun.Core.Boolean, as: LogicalNot.not(Boolean.true?(self))
end