return
        }

        // Write the mask to start a multibyte value.
        out.writeByte(bits or prefixMask)
        value -= prefixMask

        // Write 7 bits at a time 'til we're done.
        while (value >= 0x80) {
          val b = value and 0x7f
          out.writeByte(b or 0x80)
          value = value ushr 7
        }
        out.writeByte(value)
      }

        return earliestEvictableIdleAtNs + keepAliveDurationNs - now
      }

      inUseConnectionCount > 0 -> {
        // All connections are in use. It'll be at least the keep alive duration 'til we run again.
        return keepAliveDurationNs
      }

      else -> {
        // No connections, idle or in use.
        return -1
      }
    }
  }