Object variable don't display in a twig template - php

Question

I find this strange behaviour when using Twig (v1.23.3)
In a templace I have an array of objects : I use the dump function to display it, like this :
<pre align="left" style="text-align: left; font-size: 80%">
{{ dump(current_balances) }}
</pre>
{% for key, val in current_balances %}
{{ val.name }} : {{ val.balance | number_format(2, '.', ' ') }} €<br>
{% else %}
Aucun solde trouvé.
{% endfor %}
The output of dump is as expected :
array(2) {
[0]=>
object(Record)#20 (3) {
["name"]=>
string(32) "Bank 1 - Account"
["balance"]=>
string(7) "2000.00"
}
[1]=>
object(Record)#21 (3) {
["name"]=>
string(32) "Bank 2 - Account"
["balance"]=>
string(8) "1000.00"
}
}
But the output of the for loop is not correct. {{ val.name }} is displayed, but {{ val.balance }} is empty.
I dit this kind of loops hundreds of time - this code is merely cut-and-paste from a template that works.
Event more curious is that, if I invert the order of the vars in the object (as is it matters), putting balance before name, then balance is displayed, and not name !
Don't really know where to look with this one. Of course, my template are rendered with controllers calling models, so this is only a little part of the code.
I think I found a bug, similar to Variables not replaced in Twig template but it's hard to tell.

Answer 1

That's not a bug ! I finally enable the cache in Twig and looked at the resulting code. Guess what ? Some non-printable char has find its way near the val.balance. A "cat -A" on the template file shows this :
{{ val.name }} : {{M-BM- val.balance }} M-bM-^BM-,<br>$
And result in this in the compiled template :
$this->getAttribute((isset($context[" val"]) ? $context[" val"] : null)
Noticed the space before val ?
Lost one hour with this one. Source problem is an obsolete frenck keymap in Debian....