Cookbook Filtering collections: outdated id references

[mrflix]

I just stumbled upon this outdated info in the filter collections cookbook that pages, files and users fields store ids and emails instead of now uuids:

• The pages field stores a single or multiple page ids
• The files field stores a single or multiple file ids
• The users field stores a single or multiple user emails

[mrflix]

I was searching for a way to filter pages by category. The categories are organized as pages and the categories field is a pages file. In the category pages I show the pages with said category as a pages section and I remembered this simpler technique to filter the pages field: filter('categories', '*=', page.uuid)