Collections in Twig

[AugustMiller]

We should explicitly state that Collections in Twig behave exactly the same as collections in PHP, except for methods that only accept anonymous functions/closures as arguments.

• How to use arrow functions as callable? twigphp/Twig#3402

[khalwat]

And potentially add a link to Craft Closure, which allows you to use Collections in Twig the way you thought you could:

https://github.com/nystudio107/craft-closure