Re: [PATCH 03/23] Introduce "skip-worktree" bit in index, teach Git to get/set this bit

> +Skip-worktree bit
> +-----------------
> +
> +Skip-worktree bit can be defined in one (long) sentence: When reading
> +an entry, if it is marked as skip-worktree, then Git pretends its
> +working directory version is up to date and read the index version
> +instead.
> +
> +To elaborate, "reading" means checking for file existence, reading
> +file attributes or file content. The working directory version may be
> +present or absent. If present, its content may match against the index
> +version or not. Writing is not affected by this bit, content safety
> +is still first priority. Note that Git _can_ update working directory
> +file, that is marked skip-worktree, if it is safe to do so (i.e.
> +working directory version matches index version)
> +
> +Although this bit looks similar to assume-unchanged bit, its goal is
> +different from assume-unchanged bit's. Skip-worktree also takes
> +precedence over assume-unchanged bit when both are set.