Kind of a bummer that decorator metadata won't be supported, but this is at least a step in the right direction.
I'm looking forward to the day that I can write validation decorators for intersections, unions, and generics without doing any crazy hacks.
Exciting to see Decorators on the next release. I personally find them really neat so I want to use them in some way. Unfortunately the last few times I tried it using the experimental flag, it came with more trouble compared to not using it. Will probably revisit it when it's out of beta.