@ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun iterator(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    set("a", "a1", "a2")
    set("b", "b1", "b2")
    set("c", "c1", "c2")
    val iterator = cache.snapshots()
    assertThat(iterator.hasNext()).isTrue()
    iterator.next().use {
      assertThat(it.key()).isEqualTo("a")

    or newer.

    ```kotlin
    implementation("com.squareup.okio:okio:1.17.3")
    ```

 *  Fix: Don't miss cancels when sending HTTP/2 request headers.
 *  Fix: Don't miss whole operation timeouts when calls redirect.
 *  Fix: Don't leak connections if web sockets have malformed responses or if `onOpen()` throws.
 *  Fix: Don't retry when request bodies fail due to `FileNotFoundException`.

	public final fun getDate (Ljava/lang/String;)Ljava/util/Date;
	public final fun getInstant (Ljava/lang/String;)Ljava/time/Instant;
	public fun hashCode ()I
	public fun iterator ()Ljava/util/Iterator;
	public final fun name (I)Ljava/lang/String;
	public final fun names ()Ljava/util/Set;
	public final fun newBuilder ()Lokhttp3/Headers$Builder;
	public static final fun of (Ljava/util/Map;)Lokhttp3/Headers;