140bytes, completeObjectClone polyfill

annotated.js

function(
         a,                                  // object to clone
         b                                   // placeholder
){
  with(Object)                               // import Object.*
    return getOwnPropertyNames(a)            // get property names
      .map(b=function(c){                    // iterate names
        b[c]=getOwnPropertyDescriptor(a,c)   // get descriptors
      }),
      create(getPrototypeOf(a),b)            // get proto and create clone
}

index.js

function(a,b){with(Object)return getOwnPropertyNames(a).map(b=function(c){b[c]=getOwnPropertyDescriptor(a,c)}),create(getPrototypeOf(a),b)}

LICENSE.txt

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

package.json

{
  "name": "completeObjectClone",

  "description": "Fully clones an object using Object.create, Object.getPrototypeOf, Object.getOwnPropertyNames, and Object.getOwnPropertyDescriptor.",

  "keywords": [
    "es5",
    "object",
    "descriptor",
    "prototype",
    "clone"
  ]
}