```doc
# Bitwise And

Values which wish to implement the `&` infix operator must implement this protocol.
```
protocol BitwiseAnd, as: do
  ```doc
  And `self` and `other` together, returning an option.

  It is left up to the implementer to define when it should return `Some` or `None`.
  ```
  def and(self: Self, other: Any): Option
end