History_stats - Docs wrong? Or bug? Or me?

Configuration
1

I want to count every time a binary_sensor changes state. the docs say that the state can be a list.

image

But this doesn’t work (for me)

  - platform: history_stats
    name: Rain Gauge Tips Today
    entity_id: binary_sensor.rain_gauge
    state: 
      - "off"
      - "on"
    type: count
    start: "{{ now().replace(hour=0, minute=0, second=0) }}"
    end: "{{ now() }}"

For the record and to pre-empt history, recorder etc. questions these do,

    state: "on"

    state: "off"

    state: 
      - "on"

    state: 
      - "off"