In D8524#134322, @mharbison72 wrote:

The documentation updates look good to me, but there are still some code changes that were probably not intentional, and the commit message probably needs an update.

Nothing uses this directly, but it makes it much easier to another extension to call into this code and be able to request different diff options

It gets a little messy when uploading partial patches to code that I am patching

I thought I would at least keep the help message updates instead of scrapping the whole thing.

I finally got around to looking at why I needed this. It turned out to be pretty complicated, and although this patch would work for me, I'm sure there are other ways to work around this so it may not make sense to land.

I got crashes without vcr enabled

Maybe this should be in the patch comment, but justification for the change: