Don't seem able to access values

[jeremycherfas]

I know you said we have to implement ourselves, but I have a problem.

{{ dump(page.header.import) }} works fine and tells me I have a nested array with three top-level elements. But absolutely everything I have tried to access the first element has failed.

{{ dump(page.header.import[0]) }} gives null

I tried to get back to basics.

{% set myvar = ['foo','bar','crap'] %}
{% set newvar = ( myvar|slice(0, 1)) %}

Works exactly as expected. But {% set newvar = ( page.header.import|slice(0, 1)) %} results in a blank, not null, when I {{ dump(newvar) }}

I really want to be able to access that array that is the top element, but I just cannot see how. Any help gratefully received.