I've seen quite a few pull requests merged that involved the expression system.
The current version of the release notes page says only that, as part of App:Link, changes were made that affect Expressions. It says the changes are described in the 'core changes' page which links to RealThunders github wiki
. But that page says the changes aren't considered mature and aren't merged to upstream.
So, can someone summarize what has actually changed about Expressions? What's still pending or likely to be merged into 0.19?