Enhances the liquid built-in first filter to work with Paginate objects.

When invoked on a Paginate object, it returns the first item from the current page.

Examples:

{% assign order = user.orders | first %}
{{ order.code }}
{% assign country = website.countries | first %}
{{ country.name }}

{% comment %}
Outputs:
ORD1-123456
Afghanistan
{% endcomment %}