@@can.getOwnKeyDescriptor(key)

Return a single key's descriptor from the object, as defined by the custom behavior of this function.

var shapeless = {};

// Nothing enumerable in a shapeless object
shapeless[canSymbol.for('can.getOwnKeyDescriptor')] = function() { return; }

// Banana is on the prototype chain, so default "own key descriptor" functions would not return it.
var thingsInMyEar = Object.create(
    "banana": {
        peeled: false
    }
});

thingsInMyEar[canSymbol.for('can.getOwnKeyDescriptor')] = function(key) { 
    if(Object.getOwnPropertyNames(this).indexOf(key) || key === "banana") {
        return !!Object.getOwnPropertyDescriptor(this, key) ||
            this[canSysmbol.for('can.getOwnKeyDescritpor')].call(this[canSymbol.for('proto')], key);
    };  // There's always a banana in my ear
};