text: // Copyright (C) 2020 Alexey Shvayka. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  /*---
  esid: sec-object.assign
  description: >
    Proxy keys are iterated in order they were provided by "ownKeys" trap.
  info: |
    Object.assign ( target, ...sources )
  
    [...]
    4. For each element nextSource of sources, in ascending index order, do
      a. If nextSource is neither undefined nor null, then
        [...]
        ii. Let keys be ? from.[[OwnPropertyKeys]]().
        iii. For each element nextKey of keys in List order, do
          1. Let desc be ? from.[[GetOwnProperty]](nextKey).
  
    [[OwnPropertyKeys]] ( )
  
    [...]
    7. Let trapResultArray be ? Call(trap, handler, « target »).
    8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).
    [...]
    23. Return trapResult.
  features: [Proxy, Symbol]
  includes: [compareArray.js]
  ---*/
  
  var getOwnKeys = [];
  var ownKeysResult = [Symbol(), "foo", "0"];
  var proxy = new Proxy({}, {
    getOwnPropertyDescriptor: function(_target, key) {
      getOwnKeys.push(key);
    },
    ownKeys: function() {
      return ownKeysResult;
    },
  });
  
  Object.assign({}, proxy);
  assert.compareArray(getOwnKeys, ownKeysResult);
  