function getNormalization(element, propertyName) {
    var data = Data(element);
    var fn = void 0;
    for (var index = constructors.length - 1, types = data.types; !fn && index >= 0; index--) {
        if (types & 1 << index) {
            // tslint:disable-line:no-bitwise
            fn = Normalizations[index][propertyName];
        }
    }
    return fn;
}
Get the normalization for an element and propertyName combination. This
value should be cached at asking time, as it may change if the user adds
more normalizations.