code: public TaskSchedulerBuilder customizers(TaskSchedulerCustomizer... customizers) {
  		Assert.notNull(customizers, "Customizers must not be null");
  		return customizers(Arrays.asList(customizers));
  	}
docs: Set the {@link TaskSchedulerCustomizer TaskSchedulerCustomizers} that should be
  applied to the {@link ThreadPoolTaskScheduler}. Customizers are applied in the
  order that they were added after builder configuration has been applied. Setting
  this value will replace any previously configured customizers.
  @param customizers the customizers to set
  @return a new builder instance
  @see #additionalCustomizers(TaskSchedulerCustomizer...)