val headers =
      Headers
        .Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    assertThat(headers.toString()).isEqualTo(
      """
      |content-length: 99
      |authorization: ██

    val headers =
      Headers
        .Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    val request =
      Request(
        "https://square.com".toHttpUrl(),
        headers,
      )

    val headers =
      Headers
        .Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    val request =
      Request(
        "https://square.com".toHttpUrl(),
        headers,
      )

// https://www.iana.org/domains/root/db/coach.html
coach

// codes : Binky Moon, LLC
// https://www.iana.org/domains/root/db/codes.html
codes

// coffee : Binky Moon, LLC
// https://www.iana.org/domains/root/db/coffee.html
coffee

// college : XYZ.COM LLC
// https://www.iana.org/domains/root/db/college.html
college

// cologne : dotKoeln GmbH

co.uz
co.ve
co.vi
co.za
co.zm
co.zw
coach
cockpit.fr-par.scw.cloud
cockpit.nl-ams.scw.cloud
cockpit.pl-waw.scw.cloud
cocotte.jp
codeberg.page
codes
codespot.com
coffee
cog.mi.us
col.ng
college
collegefan.org
cologne
com
com.ac
com.af
com.ag
com.ai
com.al
com.am
com.ar
com.au
com.aw
com.az
com.ba
com.bb

co.uz
co.ve
co.vi
co.za
co.zm
co.zw
coach
cockpit.fr-par.scw.cloud
cockpit.nl-ams.scw.cloud
cockpit.pl-waw.scw.cloud
cocotte.jp
codeberg.page
codes
codespot.com
coffee
cog.mi.us
col.ng
college
collegefan.org
cologne
com
com.ac
com.af
com.ag
com.ai
com.al
com.am
com.ar
com.au
com.aw
com.az
com.ba
com.bb

    private final Queue<E> delegate = new LinkedList<>();
    private final Object mutex = new Object[0]; // something Serializable

    @Override
    public boolean offer(E o) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.offer(o);
    }

    @Override
    public @Nullable E poll() {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.poll();
    }

    @Override

    <glob pattern="*.clj"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-coffeescript">
    <_comment>CoffeeScript source code</_comment>
    <glob pattern="*.coffee"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-csrc">
    <alias type="text/x-c"/>
    <_comment>C source code</_comment>
    <magic priority="30">

   */
  @CanIgnoreReturnValue // pushed down from class to method
  @Override
  public boolean add(E e) {
    return offer(e);
  }

  /**
   * Inserts the specified element into this priority queue.
   *
   * @param e the element to add
   * @return {@code true} (as specified by {@link Queue#offer})
   * @throws ClassCastException if the specified element cannot be compared with elements currently

    private final Deque<E> delegate = new LinkedList<>();
    private final Object mutex = new Object[0]; // something Serializable

    @Override
    public boolean offer(E o) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.offer(o);
    }

    @Override
    public @Nullable E poll() {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.poll();
    }

    @Override