<link> using {{ base_url }} breaks when on home page with hidden slug

If we use this snippet, as suggested in the documentation:

But use it on the home page, while having it set so that the home page slug is hidden, then this ends up resulting in something like this:

Which is obviously not correct. I wonder if this is a solid alternative?

{% set rss_url = page.url(true) ~ page.template() ~ ".rss" %}

It works for my current use-case, but might break in other circumstances?

Start by reproducing the documented {{ base_url }}.rss snippet on the home page with the slug hidden, then compare its output with the proposed page.url(true) and page.template() expression. Done means the generated RSS link is valid for this configuration without breaking other page contexts.

Written by the indexing model from the issue text.