Re: [PATCH 0/4] worktree: Support `--orphan` when creating new worktrees

>
> I'm pretty sure that we don't want to go the route of using
> heavyweight and heavily-featured `git checkout` as a substitute for
> lightweight `git reset --hard`. In fact, worktree functionality
> started life as a special checkout mode invoked by `git checkout
> --to`. A good deal of work[2][3][4] went into extracting that
> functionality to a standalone `git worktree add` command, and
> eventually ridding `git worktree add` of its unfortunate dependency
> upon `git checkout` as a backend[5][6][7], and ridding `git checkout`
> of its ugly intimate specialized knowledge of a newly-crafted
> worktree.
>
> The key motivation for rejecting `git checkout` as backend and
> migrating to `git reset --hard` came from Junio[8][9], and I trust
> that his observations are still pertinent.
>
> So, rather than swapping out `git reset --hard` in favor of `git
> checkout`, we probably want to stick with the already-established
> approach of adding the necessary machinery to `git worktree add`
> itself (or by refactoring `git checkout` machinery to be reusable),
> just as we did for other `git worktree` options which have `git
> checkout` counterparts, such as --track[10], --guess-remote[11],
> --[no]-checkout[12], --quiet[13], etc.