* builder.build().trimmed()}.
   */
  public static Builder builder() {
    return new Builder(10);
  }

  /**
   * A builder for {@link ImmutableDoubleArray} instances; obtained using {@link
   * ImmutableDoubleArray#builder}.
   */
  public static final class Builder {
    private double[] array;
    private int count = 0; // <= array.length

    Builder(int initialCapacity) {