How to create an array in Liquid?

The official doc of Liquid doesn’t tell us a way to create an array except this:

{% assign beatles = "John, Paul, George, Ringo" | split: ", " %}

{% for member in beatles %}
  {{ member }}
{% endfor %}

But what if you want to create an array of objects? Well, there’s a trick. First, create an empty array using split and then add your object to the array using push.

{% assign posts = "" | split: "," %}
{% assign posts = posts | push: post %}