Explanation about update to luatex received via tlmgr

[Sergio Callegari]

Hi,

Today I have received some updates to my texlive 2023 system via `tlmgr 
update --all`.

Among them, I got:

`[2/3, 00:02/00:17] update: luatex [1916k] (66784 -> 66967) ... done`

It is my understanding that the `66967` corresponds to an svn commit in 
the texlive trunk branch. So I went looking for it and I found:

`texlive[66967] trunk: LuaTeX 1.17.0` 
(https://tug.org/pipermail/tex-live-commits/2023-April/025590.html).

However, I have not received luatex 1.17.0.  As a matter of fact, my 
luatex appears to be exactly the same it was before the update.

So, what was this update about? What am I missing about how to 
understand what goes into an updated package?

Incidentally, I would like to also ask why 
http://tug.org/svn/texlive?view=revision&revision=66967 is not browsable.

Thanks,

Sergio