It would be convenient to mark a PR as dependent on a JEP being targeted. This would help prevent accidental premature integration, and would also be a clear indication to any reader or Reviewer that the PR is part of an ongoing JEP.

Conceptually, this would be similar to the CSR mechanism.

The command might be `/jep NNNNNNN` where the number is the JEP Issue Number. This would set a label on the PR, and would treat the JEP issue as an integration blocker until the JEP has been targeted.