switch (elements.length) {
      case 0:
        return of();
      case 1:
        return of(elements[0]);
      default:
        return construct(elements.length, elements.clone());
    }
  }

  ImmutableSet() {}

  /** Returns {@code true} if the {@code hashCode()} method runs quickly. */
  boolean isHashCodeFast() {
    return false;
  }

  @Override

      this.expandTableThreshold = 0;
    }

    RegularSetBuilderImpl(RegularSetBuilderImpl<E> toCopy) {
      super(toCopy);
      this.hashTable = (toCopy.hashTable == null) ? null : toCopy.hashTable.clone();
      this.maxRunBeforeFallback = toCopy.maxRunBeforeFallback;
      this.expandTableThreshold = toCopy.expandTableThreshold;
      this.hashCode = toCopy.hashCode;
    }

    @Override