Wait but find isn't a builtin command right? What do you mean by the odds and ends of GNU find not being there? That doesn't depend on the shell, it's an external program being called.
It does depend on the shell here, bun is reimplementing basic commands to make them cross platform, like rm -rf is not running the rm binary because that doesn’t work on windows
Ahh I see now! I thought they were only doing what you're describing for shell builtins. That does seem like a big effort though, now that you mention it...