Layout lookup: why `single.html.html` precedes `demolayout.html`

[agronskiy]

Hello, here an “understanding” question:

reading layout lookup rules https://gohugo.io/templates/lookup-order/#examples-layout-lookup-for-regular-pages (section “single page in section with layout set”), why does it have that single.html.html precedes demolayout.html?

layouts/posts/demolayout.html.html
layouts/posts/single.html.html
layouts/posts/demolayout.html
layouts/posts/single.html 

Does it break “most specific first” rule? Or is duplicate extension a way to additionally stratify the level of specificity?

Thanks!

[pamubay]

layouts/posts/single.html.html

actually:

layouts/posts/single.[outputFormat].[suffix]

HTML Output Format, has html as suffix.
So yes it’s more specific than:

layouts/posts/demolayout.html

which translates to

layouts/posts/[layoutName].html

Nice Guide about template lookup order:

Template Lookup: A Guide

Hugo’s Templates Lookup Docs ref Demo / Source Looking at the extensive list of examples in the docs might be a bit overwhelming to new Hugo users, but it is not that complicated once we break it down. Layout files are generally in the pattern: 1 2 3 4 5 6 layoutDir / [directory] / filename . [lang] . [outputformat] . suffix Let’s look at each page .Kind to see how the values of these parts are affected: home content/_index.md => …

[agronskiy]

Thanks @pamubay ! It clarifies things!