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From:   Junio C Hamano <gitster@pobox.com>
To:     Elijah Newren <newren@gmail.com>
Cc:     Duy Nguyen <pclouds@gmail.com>,
        Thomas Gummerer <t.gummerer@gmail.com>,
        Git Mailing List <git@vger.kernel.org>
Subject: Re: [PATCH 6/8] checkout: add --cached option
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Date:   Tue, 19 Feb 2019 14:36:54 -0800
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        (Elijah Newren's message of "Tue, 19 Feb 2019 14:24:28 -0800")
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Elijah Newren <newren@gmail.com> writes:

>> As long as worktree-only mode does not lose track of a
>> previously-untracked path in the index (perhaps use the i-t-a bit),
>> I do not have a strong objection against making the worktree-only
>> mode the default.
>
> Could you unpack that for me a bit?

Suppose in an ancient version v1.0 there was a file called
README.txt but these days such a file does not exist (there may be
README.md added though).  By default, the command does not stuff the
contents to the index out of the tree and instead operate only on
the working tree.

  $ git restore-path --source v1.0 README.txt

At this point, you are assuming that README.txt will become
untracked and the user needs to manually add it.  I was asking if it
makes sense to at least make the index "aware of" it with I-T-A bit,
and I am leaning towards answering "yes" to that question.