(cherry picked from commit 99f6558)

(cherry picked from commit 6bea8e3)

This version has been rebuilt to have 32 threads by default, instead of 512 as
it accidentally happened before.  The large number of threads caused problems on
some platforms, including `StackOverflowError`s.

Fix #43008.

We still had some discrepancies between what the code thought could be
computed for a layout, and what we actually could compute layout for.
This hopefully makes those two computations now always give the same
answers (with the assistance of the layout cache).

Fixes #43303

(cherry picked from commit 30fe8cc)

(cherry picked from commit 4486567)

(cherry picked from commit b6d31a1)

…43317. (#43359)

(cherry picked from commit 2e9bbda)

* Look for package name in `[extras]`

When Preferences.jl set's a preferences in a non-top-level package,
it adds that package to the `[extras]` entries in the project path.

Package loading should have used thhose entries to map the module uuid
to the key name in the Preferences.toml

Fixes JuliaPackaging/Preferences.jl#24

Co-authored-by: Elliot Saba <[email protected]>
(cherry picked from commit 8197c41)

…Futures (#42339)

* add local_lock to Future, use it in fetch and put!
* add corrections to the remote/clientref logic
* add memory ordering guarantees
* serialize a (unlocked) copy of the future to avoid problems with the lock

Co-authored-by: Jameson Nash <[email protected]>
Co-authored-by: Takafumi Arakaki <[email protected]>
(cherry picked from commit 728cba3)

(cherry picked from commit 4b97df7)