Nested objects extending

[cranetm]

in jsface.extend-method nested objects instead of extending just replace each other.
Example

var Man = Class({
    config: {
        prefix: 'Mr',
        name: '',
        eyes: 'green',
        hair: 'blonde',
        rightHanded: true
    },
    constructor: function (name) {
        this.config.name = name;
    },

    echo: function () {
        console.log(JSON.stringify(this.config));
    }
});

var Woman = Class(Man, {
    config: {
        prefix: 'Ms',
        eyes: 'blue'
    }
});
var jack = new Man("Jack");
jack.echo();
var rika = new Woman("Rika");
rika.echo();

and as a result we've got
{"prefix":"Mr","name":"Jack","eyes":"green","hair":"blonde","rightHanded":true}
{"prefix":"Ms","eyes":"blue","name":"Rika"}
(name presents because of contructor)

In my opinion its incorrect behavior, all properties must inherit instead of whole object replacing, but only in case of simple objects (not for classes).