// This work was already done by calling lruEntries.get().
      }

      else -> throw IOException("unexpected journal line: $line")
    }
  }

  /**
   * Computes the initial size and collects garbage as a part of opening the cache. Dirty entries
   * are assumed to be inconsistent and will be deleted.
   */
  @Throws(IOException::class)
  private fun processJournal() {

Typically HTTP headers work like a `Map<String, String>`: each field has one value or none. But some headers permit multiple values, like Guava's [Multimap](https://guava.dev/releases/23.0/api/docs/com/google/common/collect/Multimap.html). For example, it's legal and common for an HTTP response to supply multiple `Vary` headers. OkHttp's APIs attempt to make both cases comfortable.