Smarty v5 $smarty.template behavior doesn't match v5 documentation (it now includes a type and directory part)

Since version Smarty v5, the $smarty.template variable returns the type.path/file name of the current template, despite the documentation claiming that it "Returns the name of the current template being processed (without the directory)".
https://smarty-php.github.io/smarty/stable/designers/language-variables/language-variables-smarty/#smartytemplate

For a given template name e.g. components/topmenubar.html
This is what I got with v3 and v4:
topmenubar.html
and this is what I get in 5.10.0:
file:components/topmenubar.html

So the behavior doesn't match the documentation.

Background info:
I use the full template path and file name to pass to a translation modifier by placing this at the top of each template (|basename is added for v5):
[% $template = "`$smarty.current_dir`/`$smarty.template|basename`" scope="root" %]
and then translating all template strings for the current template this way:
[% 'Log off'|xlat:$template|escape %]
If there were an easier way to get the current template path + file from which a modifier is being called, then I'd use that.

Start by reviewing the Smarty v5 documentation page for $smarty.template and reproduce the reported result with a template such as components/topmenubar.html on version 5.10.0. Compare the v3/v4 and v5 outputs, then determine whether the documented behavior or the implementation should change; done means the behavior and documentation agree.