So a few days ago I was on the Slack channel and someone stated that the mix formatter was designed in private. Then someone corrected and stated it was not made in private but that there were public discussions on it. I can’t seem to remember which username made the correction but I’m wondering where the discussions happened online to be able to read about them and learn about the opinions.
Like most new features in Elixir it was partly discussed internally in the core team and in public. Usually in the early stages of a project it makes more sense to discuss things in a smaller group until you have a good idea what the project is actually about.
Those discussions did not happen in a single place, if you search this forum, the elixir-lang-core mailing list, and the Elixir issue tracker you will find plenty discussions 
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