/**
   * Returns a {@code Collector} that accumulates the input elements into a new {@code
   * ImmutableSet}. Elements appear in the resulting set in the encounter order of the stream; if
   * the stream contains duplicates (according to {@link Object#equals(Object)}), only the first
   * duplicate in encounter order will appear in the result.
   *
   * @since 21.0
   */

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.stream.Collector;
import jsinterop.annotations.JsMethod;
import org.jspecify.annotations.Nullable;

/**
 * GWT emulated version of {@link com.google.common.collect.ImmutableSet}. For the unsorted sets,

    // If this succeeds, too many requests were made.
    executeSynchronously("/")
      .assertFailure(IOException::class.java)
      .assertFailureMatches(
        "stream was reset: CANCEL",
        "unexpected end of stream on " + server.url("/").redact(),
      )
  }

  @RetryingTest(5)
  @Flaky
  fun recoverWhenRetryOnConnectionFailureIsFalse_HTTP2() {
    enableProtocol(Protocol.HTTP_2)

            if (clazz.isAssignableFrom(List.class)) {
                return (T) value;
            }
            if (clazz.isAssignableFrom(String[].class)) {
                return (T) ((List<?>) value).stream().filter(s -> s != null).map(Object::toString).toArray(n -> new String[n]);
            }

            if (((List<?>) value).isEmpty()) {
                return null;
            }

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.function.BiPredicate;
import java.util.stream.Collector;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Tester for {@code Collector} implementations.
 *
 * <p>Example usage:
 *
 * <pre>

from your test's `tearDown()`.

### API

#### MockResponse

Mock responses default to an empty response body and a `200` status code.
You can set a custom body with a string, input stream or byte array. Also
add headers with a fluent builder API.

### Java
```java
MockResponse response = new MockResponse.Builder()
    .addHeader("Content-Type", "application/json; charset=utf-8")

    override fun close() {
      if (closed) return
      closed = true
      if (contentLength != -1L && bytesReceived != contentLength) {
        throw ProtocolException("unexpected end of stream")
      }
      try {
        super.close()
        complete(null)
      } catch (e: IOException) {
        throw complete(e)!!
      }
    }

      return StringCharsetFunnel.class.hashCode() ^ charset.hashCode();
    }

    Object writeReplace() {
      return new SerializedForm(charset);
    }

    private void readObject(ObjectInputStream stream) throws InvalidObjectException {
      throw new InvalidObjectException("Use SerializedForm");
    }

    private static final class SerializedForm implements Serializable {

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.function.BiPredicate;
import java.util.stream.Collector;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Tester for {@code Collector} implementations.
 *
 * <p>Example usage:
 *
 * <pre>

      return StringCharsetFunnel.class.hashCode() ^ charset.hashCode();
    }

    Object writeReplace() {
      return new SerializedForm(charset);
    }

    private void readObject(ObjectInputStream stream) throws InvalidObjectException {
      throw new InvalidObjectException("Use SerializedForm");
    }

    private static final class SerializedForm implements Serializable {