ThijsvdLaar

Dmitri will propose an improvement to 4)

Hi @ivan-bocharov , looks cool, I like how this enables the user to pass hyper-parameters to the model constructor. I tried to rewrite the Kalman smoother demo with the `@ffg`...

I see, nice, simply returning `x::Vector{Variable}` then looks even simpler. To me, the `←` still has added value if it allows us to circumvent the `where` statement, i.e. `x[t] ←...