fun runningCallsCount(): Int = this.withLock { runningAsyncCalls.size + runningSyncCalls.size }

  @JvmName("-deprecated_executorService")
  @Deprecated(
    message = "moved to val",
    replaceWith = ReplaceWith(expression = "executorService"),
    level = DeprecationLevel.ERROR,
  )
  fun executorService(): ExecutorService = executorService