text: "use strict";
  
  var forEach       = require("./for-each")
    , isPlainObject = require("./is-plain-object")
    , ensureValue   = require("./valid-value")
    , isArray       = Array.isArray;
  
  var copyValue = function (value, ancestors, ancestorsCopy) {
  	var mode;
  	if (isPlainObject(value)) mode = "object";
  	else if (isArray(value)) mode = "array";
  	if (!mode) return value;
  
  	var copy = ancestorsCopy[ancestors.indexOf(value)];
  	if (copy) return copy;
  	copy = mode === "object" ? {} : [];
  
  	ancestors.push(value);
  	ancestorsCopy.push(copy);
  	if (mode === "object") {
  		forEach(value, function (item, key) {
  			copy[key] = copyValue(item, ancestors, ancestorsCopy);
  		});
  	} else {
  		value.forEach(function (item, index) {
  			copy[index] = copyValue(item, ancestors, ancestorsCopy);
  		});
  	}
  	ancestors.pop();
  	ancestorsCopy.pop();
  
  	return copy;
  };
  
  module.exports = function (source) {
  	return copyValue(ensureValue(source), [], []);
  };
  