Re: [PATCH 1/1] read-cache: update index format default to v4

SZEDER Gábor [off-list ref] writes:

On Mon, Sep 24, 2018 at 02:15:30PM -0700, Derrick Stolee via GitGitGadget wrote:

quoted

From: Derrick Stolee <redacted>

The index v4 format has been available since 2012 with 9d22778
"reach-cache.c: write prefix-compressed names in the index". Since
the format has been stable for so long, almost all versions of Git
in use today understand version 4, removing one barrier to upgrade
-- that someone may want to downgrade and needs a working repo.

What about alternative implementations, like JGit, libgit2, etc.?

Good question.

Because the index-version of an index file is designed to be sticky,
repos that need to be accessed by other implementations can keep
whatever current version.  A new repo that need to be accessed by
them can be (forcibly) written in v2 and keep its v2ness, I would
think.

And that would serve as an incentive for the implementations to
catch up ;-)