In the stupid idea of the day department, for some reason I have felt the
urge more than once in recent months for an operator which would invert the
value of a boolean variable while evaluating to its pre-inversion value.
For example:
```js
if (bool!!) console.log("used to be true");
```
The post-inversion case is less important since I can just write `if (bool
= !bool)`.
Bob
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