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I'm excited about the new code formatting abilities. In particular, I haven't yet found a good way to "format on save" changes in .heex templates, and hopefully this will change that!
That looks great, it's a pet peeve of mine that it's difficult to format languages that are encased in another language. Most (all?) editors are only expecting a single "language" in a file. You have a js file? Must contain only JavaScript!
Unrelated to 1.13 but thanks to the release notes, I now know about Zigler; which looks really neat.