assertThat(pool.closeConnections(150L)).isEqualTo(0)
    assertThat(pool.connectionCount()).isEqualTo(0)
    assertThat(c1.socket().isClosed).isTrue()

    // Running again, the pool reports that no further runs are necessary.
    assertThat(pool.closeConnections(150L)).isEqualTo(-1)
    assertThat(pool.connectionCount()).isEqualTo(0)
    assertThat(c1.socket().isClosed).isTrue()
  }

[graalvm]: https://www.graalvm.org/
[graalvm_21]: https://www.graalvm.org/release-notes/21_0/
[graalvm_22]: https://www.graalvm.org/release-notes/22_2/
[idna_15_1_0]: https://www.unicode.org/reports/tr46/#Modifications
[kotlin_1_4_20]: https://github.com/JetBrains/kotlin/releases/tag/v1.4.20
[kotlin_1_5_31]: https://github.com/JetBrains/kotlin/releases/tag/v1.5.31

   *  * A `SYN_RESET` frame abnormally terminates the stream.
   *  * Both input and output streams have transmitted all data and headers.
   *
   * Note that the input stream may continue to yield data even after a stream reports itself as
   * not open. This is because input data is buffered.
   */
  val isOpen: Boolean
    get() {
      this.withLock {
        if (errorCode != null) {
          return false
        }