Support for Tuples

[tjsmith-meta]

Description

I encountered that Tuples behaved differently in MiniJinja and then noticed that it is indeed documented that they aren't supported.
https://github.com/mitsuhiko/minijinja/blob/main/COMPATIBILITY.md#tuples

Here's an example.

Input template

{% set foo = ('bar','baz') %}
{{ foo }}

Python Jinja2 output

('bar', 'baz')

MiniJinja output

["bar", "baz"]

Reproduction steps

1. Feed the input template through Python Jinja2
2. Feed the input template through MiniJinja
3. See that the results are not the same

What did you expect

Would love to see Tuples supported at parity in MiniJinja with Python Jinja2. Is this a technically complex / challenging to achieve, or has there just not been strong enough motivation yet for parity with Python Jinja2 for this?