/**
   * Returns the platform preferred map implementation that preserves insertion order when used only
   * for insertions, with a hint for how many entries to expect.
   */
  static <K, V> Map<K, V> preservesInsertionOrderOnPutsMapWithExpectedSize(int expectedSize) {
    return Maps.newLinkedHashMapWithExpectedSize(expectedSize);
  }

  /**
   * Returns the platform preferred set implementation that preserves insertion order when used only

   * for insertions, with a hint for how many entries to expect.
   */
  static <K extends @Nullable Object, V extends @Nullable Object>
      Map<K, V> preservesInsertionOrderOnPutsMapWithExpectedSize(int expectedSize) {
    return Maps.newLinkedHashMapWithExpectedSize(expectedSize);
  }

  /**
   * Returns the platform preferred set implementation that preserves insertion order when used only

   * for insertions, with a hint for how many entries to expect.
   */
  static <K extends @Nullable Object, V extends @Nullable Object>
      Map<K, V> preservesInsertionOrderOnPutsMapWithExpectedSize(int expectedSize) {
    return Maps.newLinkedHashMapWithExpectedSize(expectedSize);
  }

  /**
   * Returns the platform preferred set implementation that preserves insertion order when used only

    public Builder() {}

    /** Creates a new builder with a hint for the number of distinct keys. */
    Builder(int expectedKeys) {
      if (expectedKeys > 0) {
        builderMap = Platform.preservesInsertionOrderOnPutsMapWithExpectedSize(expectedKeys);
      }
      // otherwise, leave it null to be constructed lazily
    }

    Map<K, ImmutableCollection.Builder<V>> ensureBuilderMapNonNull() {