There is no timeline for when this is going to happen.
For issues in this milestone to become relevant for maintainers we will have to finish all issues in the "before 1.0.0" milestone.
In most cases maintainers didn't even invest time to think through, how to handle them.
It might even happen that we decide to not include them into 1.0.0.

For external contributors: Before creating a PR for these, communicate in the issue, how to go about it. Ideally with a proposal and arguments.