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It is useful, but I tried to be upfront about the limitations of the current implementation.

There's no inherent reason those two features can't be supported, and I want to add support for them when I have some time.

More context: "At the moment, Zapper’s two biggest limitations are that it does not currently support conditional rendering or nested templates (like foreach loops over the elements of an interior list). Zapper could be extended to support those things, I just haven’t implemented them yet. Due to the design of Zapper, those features should have effectively no performance impact on templates that choose not to use them, which is nice."

https://news.ycombinator.com/newsguidelines.html

Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something.