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How is this better than yaml?

Less footguns, built-in validation, strong types. Me gusta.

So..why not use XML?

So that humans eyes don't bleed when they try to read it.

One of the things they bring up in the docs is lessening boilerplate. And it's hard to get more boilerplatey than XML.

Because while XML has types and schemas, the actual implementation and ergonomics is absolute garbage. Those things matter to intelligent people.