Hi Sean,
Ephemerons are working well in Pharo 9, as far as I am concerned, at least from the VM side.
We have thoroughly tested them and stressed the implementation with several thousand ephemerons.
And we have used them to prototype a precise memory profiler with a student during the summer (yet to be published).
But, there is still missing a good Ephemeron library from the image side.
We were planning on having that for Pharo 10, but if somebody wants to take the lead on that, you���re welcome.
Cheers,
G
What is the status of ephemerons/weakly held objects? Is this fully working or are there still limitations/gotchas? I have lost track