Language-provided formatters immediately end so many conversations about "correct" formatting that I consider them a requirement for a mature (read: "Would use

Language-provided formatters immediately end so many conversations about "correct" formatting that I consider them a requirement for a mature (read: "Would use in production on a project people are paying money for the success of") language these days, along with things like "IDE support," "static typing and/or sanitization analysis," and "a usable debugger."