Scenario: provide some extensions to a Java object with a JSAdapter, but have all (other) method calls fall through to the original object to provide transparent adaption.

The following implementation of __call__ facilitates this. Add an example that illustrates it. Verify it works for multiple arguments.

__call__: function() {
    var args = [x].concat(Array.prototype.slice.call(arguments, 1))
    return Function.call.apply(x[arguments[0]], args)
}