Overlapping inherited and own properties

[kownacki]

"use strict";

var clone = require("clone");

function Foo() {}
Foo.prototype.prop = 1;

var a = new Foo;
a.prop = 2;

var b = clone(a);

console.log(a, b);

Hello,

please tell if this is a bug. When parent object has an own and an inherited property with the same name, then the cloned one will not have the own one copied. This works correct if we have only an own or only an inherited one on the parent.