clone

SC = {

copy: function (object, deep) {
    var ret = object, idx;

    // fast paths
    if (object) {
      if (object.isCopyable) return object.copy(deep);
      if (object.clone)      return object.clone();
    }

    switch (SC._nativeTypeOf(object)) {
    case "array":
      ret = object.slice();

      if (deep) {
        idx = ret.length;
        while (idx--) { ret[idx] = SC.copy(ret[idx], true); }
      }
      break;

    case "object":
      ret = {};
      for (var key in object) { ret[key] = deep ? SC.copy(object[key], true) : object[key]; }
    }

    return ret;
  },
  
    _nativeTypeOf: function(item) {
    if (item === undefined) return SC.T_UNDEFINED;
    if (item === null) return SC.T_NULL;

    var nativeType = typeof item,
        toString;
    if (nativeType === "object" || nativeType === "function") {
      toString = SC._nativeToString.call(item);
      return SC._nativeTypeHash[toString] || "object";
    } else {
      return nativeType;
    }
  } ,
  // Inlined from jQuery's class2type to avoid dependency.
  _nativeTypeHash: {
    "[object Boolean]": "boolean",
    "[object Number]": "number",
    "[object String]": "string",
    "[object Function]": "function",
    "[object Array]": "array",
    "[object Date]": "date",
    "[object RegExp]": "regexp",
    "[object Object]": "object"
  },
  // Inlined from jQuery to avoid dependency.
  _nativeToString: Object.prototype.toString,
  
  }