null value representation for Thermostat.runtime.desiredFanMode

Hi all !

According to this page

The Runtime.desiredFanMode values could be one of (and I quote)...

"The desired fan mode. Values: auto, on or null if the HVAC system is off and the thermostat is not controlling a fan independently."

As string values like "auto" or "on" are not being quoted, my question is if the "null" mentioned there means:

1) a string with value "null"
2) a json null primitive (no string)
3) the property won't be included in the json response

Thanks for your time !
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