Getting data from multidimensional arrays (render array) in twig - php

Question

I have a render array for a form in my D7 module that looks like this:
'form' =>
array
'#id' => string 'demo-form' (length=9)
'#action' => string '/sprint07/' (length=10)
'name' =>
array
'#title' => string 'Username' (length=8)
'#maxlength' => int 13
'#size' => int 15
'#type' => string 'textfield' (length=9)
'#required' => boolean true
'#input' => boolean true
'#autocomplete_path' => boolean false
... snip ...
I'm using twig-for-drupal to create a theme, but I can't seem to get the values back, I've tried {{ form['name']['#type'] }}, {{ form.name.#type }}, {{ form.name['#type'] }} and so on, but they all come back blank.
Other fields such as form['#action'] works fine, so how should I access the information more than one array in? I can't change the module too much as the php template in its native state uses render(form);
-- Update --
Added some more debugging to this, and seems that I can use {{ form|dump('v') }} to show me the whole array as above, but when I do {{ form.name|dump('v') }} I just get a string, which I assume means that twig is automatically detecting its a render array, and "helpfully" converting it for me.. So I guess that makes my question: how do I turn off the auto-rendering?

Answer 1

"name" sub array don't contain the "#id" key.
try if work
{{ form.name.#title }}

Answer 2

Turns out it isn't currently possible to do this on a case-by-case basis, TFD is currently set up to auto-render anything it thinks is a render array, and to turn this off you need to set autorender to FALSE in twig_get_instance(). I've tried this myself however and it still seems to be turning the array into a string, so this could be a bug within TFD, or I just don't understand the usage, which is equally, if not more, likely.
From ReneB's sandbox:
Autorender
This version of the TWIG engine uses auto render to prevent themers get RSI from typing {{node.field_somefield|render}} for every single field they want to render from the render array (of doom) so the can safely type {{node.field_something}}
On rendering of the compiled template TFD check if the called variable is a string, callable or array. If it's a string it simple does echo $string, if it's a callable it return a proper method() for it. And if it's an array, it assumes it's a renderable array and maps it to the render($string); method of drupal.
This way the objects hidden with hide() are respected.
To turn this is for now, you have to set autorender to FALSE in the twig_get_instance() method of twig.engine.
I'am working on a {% noautorender %} {% end noautorender %} block structure.