Playing with type states and lifetime-tracking hooks, facing some unexpected behavior

[giaco]

nevermind, just spotted the missing `var` parameter in
    
    
    func condense[T](e: Experiment[T, sGas]): var Experiment[T, sLiquid] =
      cast[ptr Experiment[T, sLiquid]](e.addr)[]
    
    
    Run

but I can't find a way to avoid casts or copies while transforming and an 
Experiment object