joyent/node — pull request #3227 by rlidwka (2012-05-06 09:37:42+00:00)
Title: bug with user-supplied inspect() function returns non-string

```javascript
> require('util').inspect([{inspect: function(){return 123}}])
TypeError: Object 123 has no method 'indexOf'
at formatProperty (util.js:322:15)
```