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Range: modifiers/compound types clarification

I have checked the new range documentation from !393

speed([10kph..25kph]) modifier is equivalent to applying keep(speed in [10kph..25kph]) inside the modifier/compound type.

What I want to make sure:

  1. is this speed constant as long as we're executing the drive() action it's associated to (i.e. 13kph is chosen and it doesn't change).
  2. Or does it allow car to have any speed between 10kph and 25kph during that drive(), for example accelerating from 15kph to 20kph?

I ask because speed is technically a parameter, not a variable (keyword var), so it's supposedly constant for that specific drive action (option 1) according to the specification.
But I remember seeing some examples where speed([10kph..25kph]) seems to imply that the car can change speed as long as it's within this range (option 2).
If it's really option 2, I think it might be good to add var to all of those in standard.osc, and/or specify that all modifier parameters should be considered as variables var.