documentcloud/underscore — comment on commit 0d4b1247c45083c695cab4242c084a97aa600221
File:  line 0
By rpflorence:

It's ironic, but this actually allows AMD users to use backbone in an amd environment without hacking the source.

Backbone checks for `root._` but underscore didn't export to `root` when `define` was detected, and since underscore is a dependency it was all busted.

Now you can write a little shim to get all the libs you need for backbone w/o touching the source of any of them.

```coffeescript
define ['vendor/underscore', 'vendor/jquery', 'order!vendor/backbone'] -> Backbone
```

Good move.