The plan isn't to jettison TOML, but even though it's 'unstable,' it hasn't changed in a very long time. And, given, uh, Tom, I doubt it will very much. He has better things to do these days.
I can see an argument for INI files, but TOML is basically INI with some extensions. And YAML (which has no Rust parser, and nobody who wnats to write one) and JSON (which does have one in the standard library) are very poor configuration formats.
Which one would you have preferred? It seems like a reasonable choice to me.
> And from a purely perception manner, seemingly reaffirms concerns some have had about the bundler team building cargo (right or wrong).
You could just spell out the personnel issues rather than being all FUDdy about it. (I'm friends with Yehuda, but also was room-mates with the current maintainer of Bundler (until very recently). Bundler isn't perfect, but lots of that had to do with people assuming a pre-1.0 project is stable, and upstream bullshit with RubyGems.)
