It leaves room to change the default. It's more a pattern than a conscious decision.

Though I would recommend avoiding duplication here. As you may know, aliases can be nested and the array format is optional if there is only 1 item:

```
grunt.registerTask('test', ['jshint', 'qunit']);
grunt.registerTask('default', 'test');
```

Oh, and something about consistency in quotation marks. Although the decision over jquery projects in general is up in the air (I prefer single quotes, too), at least for now it's double quotes still.

We probably can't put it in jshintrc just yet (a few other code paths violate it), but lets do work towards that for new code.