Why is getvalueof() called multiple times for each call to notifyclients()?

I've got a js object that holds an array and defines getvalueof() and setvalueof() so I can persist to a pattr.

It works. No problem, but I noticed that when I call notifyclients() my getvalueof() method is called multiple times. I'm not sure why.

inlets = 1;
outlets = 1;

var saved_data = [];

function list(a) {
    saved_data.push( a );
    notifyclients();
    outlet(0, a);
}

function showall() {
    for (var i in saved_data) {
        post(saved_data[i] + "n");
    }
}

function clear() {
    saved_data = [];
    notifyclients();
}

function getvalueof() {
    post("Saving.n");
    return saved_data
}

function setvalueof() {
    post("Restoring.n");
    restored_data = arrayfromargs(arguments);
    saved_data = restored_data;
    post("Restored.n");
}

Here's a simple patch illustrating the behavior:

It's really bugging me. I can't tell if this is normal of if I'm missing some poor patching I did somewhere.

When I click on one of the numeric messages to be stored, getvalueof() is called 3 times?!

I must be doing something wrong. Opinions?