Fluid debugging - output all variables

Question

I try to output all variables from my view like this:

<f:debug title="all"> {_all} </f:debug>

But I only get this output:

I used to get an array which I can open and inspect deeper.

Why does it render like this?

Answer 1

Plz remove the spaces before and after {_all}. You should have:

<f:debug title="all">{_all}</f:debug>