fix: std/marshal unmarshaling of ref objects (#22983)

Fixes #16496 

![Marshal doesn't properly unmarshal *most* ref objects; the exceptions
being nil
ones](https://github-production-user-asset-6210df.s3.amazonaws.com/4764481/285471431-a39ee2c5-5670-4b12-aa10-7a10ba6b5b96.gif)
Test case added.

Note that this test (t9754) does pass locally, but there are tons of
failures by default on OS X arm64, mostly around the bohem GC, so it's
pretty spammy, and could easily have missed something. If there are
better instructions please do let me know.

---------

Co-authored-by: John Viega <viega@Johns-MacBook-Pro.local>
Co-authored-by: John Viega <viega@Johns-MBP.localdomain>
Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

0 files changed, 0 insertions, 0 deletions