A value number style binding for Knockout made using Globalize for parsing / formatting

ko.binding.valueNumber.js

ko.bindingHandlers.valueNumber = {
    init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
        // This will be called when the binding is first applied to an element
        // Set up any initial state, event handlers, etc. here

        var observable = valueAccessor(),
            properties = allBindingsAccessor();

        var interceptor = ko.computed({
          read: function () {
        	    var format = properties.numberFormat || "n2";
        	    return Globalize.format(observable(), format);
            },
            write: function (newValue) {
                var number = Globalize.parseFloat(newValue);
                if (number) {
                    observable(number);
                }
            }
        });

        if (ko.utils.tagNameLower(element) === 'input') {
            ko.applyBindingsToNode(element, { value: interceptor });
        } else {
            ko.applyBindingsToNode(element, { text: interceptor });
        }
    }
};

valueNumberBindingDemo.html

<input data-bind="valueNumber: myNumber, numberFormat: 'n0'" class="number" />

John, ko.utils.tagNameLower is not available in minified version of knockout, so this script doesn't work in production.
I suggest to change the line
if (ko.utils.tagNameLower(element) === 'input') {
with:
if (element && element.tagName && element.tagName.toLowerCase()=== 'input') {