[Bug] Number trait returns 'undefined'

Am I missing something or is this a bug?

	domComps.addType('socialbar', {
		model: dModel.extend({
			defaults: Object.assign({}, dModel.prototype.defaults, {
				showShares: 1,
				size: 32,
				radius: '4',
				droppable: !1,
				traits: [
					{
						label: "Show Shares",
						type: "checkbox",
						name: "showShares",
						changeProp: 1
					},
					{
						type: 'select',
						name: 'size',
						label: 'Icon Size',
						changeProp: 1,
						options: [
							{value: '16', name: '16 Pixels'},
							{value: '32', name: '32 Pixels'},
							{value: '64', name: '64 Pixels'}
						]
					},
					{
						type: 'number',
						name: 'radius',
						label: 'Icon Radius',
						unit: 'px',
						changeProp: 1,
					}
				]
			})
		},
		{
			isComponent: function(el) {
				if (el.getAttribute && "socialbar" == el.getAttribute("data-gjs-type")) {
					return {type: 'socialbar'};
				}
			},
		}),
		view: dView
	});