KnockoutJS Mapping toJS ignore nested keys

Question

Can I not ignore nested properties when using toJS in KnockoutJS' mapping plugin?

Example:

var obj = {
    "akey": {
        "anestedkey": "ignore",
        "anotherkey": "value"
    }
};

console.log(ko.mapping.toJS(obj, {
    "ignore": ["akey.anestedkey"],
}));

Expected output is

{
    akey: {
        anotherkey: "value"   
    }
}

Actual output is

{
    akey: {
        anestedkey: "ignore"
        anotherkey: "value"   
    }
}

JSFiddle: http://jsfiddle.net/48KVU/

Answer 1

It works if you remove the parent (if you know your key is unique in obj or if you want to remove all occurences):

var obj = {
    "akey": {
        "anestedkey": "ignore",
        "anotherkey": "value"
    }
};

console.log(ko.mapping.toJS(obj, {
    "ignore": ["anestedkey"], //here
}));

http://jsfiddle.net/GabrielTran/48KVU/1/