On Client:

now.foo = function() {
  console.log("foo");

};

I cann call this function from Server with

user.now.foo();

But if I redeclare the foo-function on client:

now.foo = function() {
  console.log("bar");
};

I cannot call it anymore from the Server. It sais;

TypeError: Property 'foo' of object #<Object> is not a function

Is there a way to override a function in the now-namespace?