Unnumbered toctree has numbers in LaTeX output

Consider this project

Project

.
├── conf.py
├── foo.rst
├── bar.rst
├── index.rst
└── index.rst

index.rst

Test
====

.. toctree::
    :numbered:
    :maxdepth: 2
    :caption: Numbered Toctree

    foo

.. toctree::
    :caption: Unnumbered Toctree

    bar

foo.rst

========
Numbered
========

Bravo
=====

Charlie
-------

bar.rst

==========
Unnumbered
==========

Bravo
=====

Charlie
-------

Output

On the HTML, everything is fine. The unnumbered toctree has unnumbered sections. It's perfect.

On the other hand, for LaTeX, the sections are still numbered:

Analysis

The latex visit_title method will always add a numbered section \section{foo}, but it should add an unnumbered \section*{foo}.

I guess this is a bug since the behavior should be the same on both outputs (html + latex).

Context

I am writing a programming course that generates a web documentation as well as a book. This book should have a frontmatter/mainmatter and backmatter. Of course, some sections in the backmatter should not be numbered.

Start at the LaTeX writer's visit_title method identified in the issue, then reproduce the example with the numbered and unnumbered toctrees in both HTML and LaTeX. Done means sections under the unnumbered toctree remain unnumbered in LaTeX while the numbered toctree is unchanged.