We currently have no interest in this from customers, so I don't plan to pursue it. If customer interest arises, there's a plausible pathway forward.

I have another patch on top of D20998 which brings unit over, but it's currently so broken that it can't diff itself.

I'm also going to collapse as much of experimental into master as I can here, make the minimum required PHP version 5.5 (see T11968), and attempt to collapse wilds.

See also https://discourse.phabricator-community.org/t/storage-upgrade-failed-class-phutilauthadapter-not-defined/3468.

Oh, no, that's unrelated:

Looking at this in slightly more detail, I think the immediate issue is just that .gitignore specifies /src/extensions/*, not /src/extensions/**.

I actually tried to use the extensions directory to hide Composer's vendored files and ran into this same issue.

The operation in PHI1329 (against a ~8GB export) went through cleanly. Remaining work here is: