Preconditions.checkNotNull(valueEquivalence);

    Map<K, V> onlyOnLeft = new LinkedHashMap<>();
    Map<K, V> onlyOnRight = new LinkedHashMap<>(right); // will whittle it down
    Map<K, V> onBoth = new LinkedHashMap<>();
    Map<K, ValueDifference<V>> differences = new LinkedHashMap<>();
    doDifference(left, right, valueEquivalence, onlyOnLeft, onlyOnRight, onBoth, differences);

    Preconditions.checkNotNull(valueEquivalence);

    Map<K, V> onlyOnLeft = new LinkedHashMap<>();
    Map<K, V> onlyOnRight = new LinkedHashMap<>(right); // will whittle it down
    Map<K, V> onBoth = new LinkedHashMap<>();
    Map<K, ValueDifference<V>> differences = new LinkedHashMap<>();
    doDifference(left, right, valueEquivalence, onlyOnLeft, onlyOnRight, onBoth, differences);

smallest idea how to set about it; and while she was peering
about anxiously among the trees, a little sharp bark just over
her head made her look up in a great hurry.

  An enormous puppy was looking down at her with large round
eyes, and feebly stretching out one paw, trying to touch her.
`Poor little thing!' said Alice, in a coaxing tone, and she tried
hard to whistle to it; but she was terribly frightened all the

smallest idea how to set about it; and while she was peering
about anxiously among the trees, a little sharp bark just over
her head made her look up in a great hurry.

  An enormous puppy was looking down at her with large round
eyes, and feebly stretching out one paw, trying to touch her.
`Poor little thing!' said Alice, in a coaxing tone, and she tried
hard to whistle to it; but she was terribly frightened all the

n     */\n    priority: ['left', 'right', 'top', 'bottom'],\n    /**\n     * @prop {number} padding=5\n     * Amount of pixel used to define a minimum distance between the boundaries\n     * and the popper. This makes sure the popper always has a little padding\n     * between the edges of its container\n     */\n    padding: 5,\n    /**\n     * @prop {String|HTMLElement} boundariesElement='scrollParent'\n     * Boundaries used by the modifier. Can be `scrollParent`, `window`,\n     * `viewport`...