nzakas/eslint — pull request #37 by jamesallardice (2013-07-15 07:33:57+00:00)
Title: Rule: Warn on comparison with NaN

We should warn when a comparison with the value `NaN` is encountered. For example:

```javascript
if ("123" == NaN) // ...
```

The warning should indicate that `isNaN` should be used instead.

See http://jslinterrors.com/use-the-isnan-function-to-compare-with-nan