Partial non-enumerable implementation

partial.js

/* partial non-enumerable property implementation
  
  Adds a flag to a weakmap saying on obj foo property bar is not enumerable.

  Then checks that flag in Object.keys emulation.
*/

// pd.Name :- https://github.com/Raynos/pd#pd.Name
var enumerables = pd.Name();

Object.defineProperty = function (obj, name, prop) {
    if (prop.enumerable === false) {
         enumerables(obj)[name] = true;
    }
    ...
};

Object.keys = function (obj) {
    var enumerabilityHash = enumerables(obj), keys = [];
    for (var k in obj) {
        if (obj.hasOwnProperty(k) && !enumerabilityHash[k]) {
             keys.push(k);
        }
    }
    return keys;
};

Object.getOwnPropertyNames = function (obj) {
    var keys = [];
    for (var k in obj) { 
        if (obj.hasOwnProperty(k)) {
             keys.push(k);
        }
    }
};