.add("publicobject.com",   "sha1/DmxUShsZuNiqPQsX2Oi9uv2sCnw=")
         .add("*.publicobject.com", "sha1/DmxUShsZuNiqPQsX2Oi9uv2sCnw=")
         .add("publicobject.com",   "sha1/SXxoaOSEzPC6BgGmxAt/EAcsajw=")
         .add("*.publicobject.com", "sha1/SXxoaOSEzPC6BgGmxAt/EAcsajw=")
         .add("publicobject.com",   "sha1/blhOM3W9V/bVQhsWAcLYwPU6n24=")

    ImmutableDoubleArray rightSized = ImmutableDoubleArray.builder(3).add(0).add(1).add(3).build();
    assertDoesntActuallyTrim(rightSized);

    ImmutableDoubleArray overSized = ImmutableDoubleArray.builder(3).add(0).add(1).build();
    assertActuallyTrims(overSized);

    ImmutableDoubleArray underSized = ImmutableDoubleArray.builder(2).add(0).add(1).add(3).build();
    assertActuallyTrims(underSized);
  }

   * without having to add {@code @SuppressWarnings}, the code can call this method.
   *
   * <p>Why <i>not</i> just add {@code SuppressWarnings}? The problem is that this method is
   * typically useful for {@code return} statements. That leaves the code with two options: Either
   * add the suppression to the whole method (which turns off checking for a large section of code),

   * without having to add {@code @SuppressWarnings}, the code can call this method.
   *
   * <p>Why <i>not</i> just add {@code SuppressWarnings}? The problem is that this method is
   * typically useful for {@code return} statements. That leaves the code with two options: Either
   * add the suppression to the whole method (which turns off checking for a large section of code),

### Add some custom `tags`, `responses`, and `dependencies` { #add-some-custom-tags-responses-and-dependencies }

We are not adding the prefix `/items` nor the `tags=["items"]` to each *path operation* because we added them to the `APIRouter`.

///

## Add custom headers { #add-custom-headers }

There are some situations in where it's useful to be able to add custom headers to the HTTP error. For example, for some types of security.

You probably won't need to use it directly in your code.

But in case you needed it for an advanced scenario, you can add custom headers:

    ImmutableSet.Builder<Object> builder = ImmutableSet.builderWithExpectedSize(6);
    builder.add(0);
    ImmutableSet<Object> unused = builder.build();
    ImmutableSet<Object> subject = builder.add(1).add(2).add(3).build();
    assertFalse(subject.contains(4));
  }

   * without having to add {@code @SuppressWarnings}, the code can call this method.
   *
   * <p>Why <i>not</i> just add {@code SuppressWarnings}? The problem is that this method is
   * typically useful for {@code return} statements. That leaves the code with two options: Either
   * add the suppression to the whole method (which turns off checking for a large section of code),

   * without having to add {@code @SuppressWarnings}, the code can call this method.
   *
   * <p>Why <i>not</i> just add {@code SuppressWarnings}? The problem is that this method is
   * typically useful for {@code return} statements. That leaves the code with two options: Either
   * add the suppression to the whole method (which turns off checking for a large section of code),

  }

  @CanIgnoreReturnValue
  @Override
  public boolean add(@ParametricNullness E object) {
    if (needsAllocArrays()) {
      allocArrays();
    }
    Set<E> delegate = delegateOrNull();
    if (delegate != null) {
      return delegate.add(object);
    }
    int[] entries = requireEntries();
    @Nullable Object[] elements = requireElements();