Truthyness in conditions

[Kijewski]

Right now, in rinja a condition is considered to match if it evaluates to true or a reference to true. That's a sensible and kinda obvious implementation.

In Jinja, Handlebars, etc. the pythonic concept of "truthiness" is used instead: https://realpython.com/python-boolean/. Everything that could be considered falsy, empty or nullish (0, None, "", [], false) will result in a missed condition.

I think that this behavior is very useful in a templating language. What do you think? Should rinja adopt that concept, too? It would not affect anyone who doesn't (want to) use it. You can write {% if !s.is_empty(), but with this change you could simply write {% if s to get the same result.

[GuillaumeGomez]

I'm shared on this: I love to have things explicit when reading the code. So forcing users to write {% if x != 0 %} instead of {% if x %} is better from this point of view.

But it's also a templating language, so maybe that's what users expect... I'm more on "explicit code" side. ^^'