Unfortunately I think the answer was nobody would use it.
> In that case, upgrade to 3.4.0 without changing the default and enable xxHash in 3.5.0 or later so you can roll back to 3.4.0 then.
This should probably say 3.4.1, not 3.4.0, in the two places in that sentence where it says 3.4.0. Right?
> Optionally replace md5 with xxHash for data integrity checksums. 30% speed up on larger (128k) docs, no difference for smaller docs.
Happy to see xxHash getting more and more popular!