What is "Package Staging" in V3?



I occasionally have found this commit (included in v198 release) recently:

The commit message says that it is "Initial v3 package staging".

I have searched the release notes (v198 and after), the Web, and this
mailing list but I can't find the word "package staging".

I want to know the entire story of this feature (because the commit says
"Initial"). Is it referred in other words? Is there any point I missed?
Please give me a clue (the actual feature name, URLs, related commits, etc.)
to research about it.


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