media/docs/_includes/snippets/is_collection.html

{%- assign _page_path_first_char = include.page.path | slice: 0, 1 -%}
{%- if _page_path_first_char == '_' -%}
  {%- assign __return = true -%}
{%- else -%}
  {%- assign __return = false -%}
{%- endif -%}