Knockout Custom Binding - Works in jsfiddle, but not in Durandal

Question

Absolutely love Durandal's architecture/clarity. But have ran into trouble getting durandal 2.0.1 to recognize any custom knockout binding.

My example View contains:

<div data-bind="test: {}" />

The binding is defined within an appBindings.js that contains:

define([ 'jquery', 'knockout'], 
  function ($, ko) {
    ko.bindingHandlers.test = {
      init: function(element, valueAccessor, allBindingsAccessor) {alert(0);},
      update: function(element, valueAccessor, allBindingsAccessor) {alert(1);}
    }
    var model = function(){} 
    return new model();
});

That is required from main:

requirejs.config({
    paths: {
        ...
        'durandal':'../lib/durandal/js',
        'jquery': '../lib/jquery/jquery-1.9.1',
        'knockout': '../lib/knockout/js/knockout-3.1.0',
        'bootstrap': '../lib/bootstrap/js/bootstrap',
        ...
        'bindings': 'bindings/appBindings'
    },
    shim: {
        'bootstrap': ['jquery'],
        //'ko-binding-test': ['jquery','knockout'],


    }
});

define(['libs/core','durandal/system', 'durandal/app',
            'durandal/viewLocator','services/resourceService','bindings'],  
    function (core, system, app, viewLocator, resourceService, bindings) {
    //...
});

Observations:

• Chrome's traffic shows appBindings.js being loaded.
• can breakpoint within appBindings.js as it gets loaded.
• but no matter what I try, init/update are never invoked.
• the binding is functional outside of durandal (http://jsfiddle.net/skysigal/8LJw5/3/)

I've also tried various other ways of loading the binding definition:

• using in main a define + shim of a non-AMD file containing the binding definition.
• loading a non-AMD file (containing the binding definition) directly from index.html using a script tag
• making it a dependency of the view, not main.

Anyone have a suggestion as to the proper way to do this?

Thank you.