Unpacking inside the function assigns into the parent scope; unpacking in the arglist binds a new variable. Should I expect that from something in https://docs.julialang.org/en/v1/manual/variables-and-scoping/ or is that arglist-unpacking a special behavior?

let x = 1
    function f(θ)
        (;x) = θ
    end

    θ₀ = (;x=2)
    @show x # 1
    f(θ₀)
    @show x # 2
end

let x = 1
    function f((;x))        
    end

    θ₀ = (;x=2)
    @show x # 1
    f(θ₀)
    @show x # 1
end

That's on 1.9.1.

@CameronBieganek says both give 1 then 2 on 1.8.2, implying the behavior changed.

I'm not sure what's supposed to happen here.

Discourse.