Versions & Revisions
Each save that changes the body or runtime stores a revision. You can restore an older one.
Labels
The first save is revision 1.1. Saving a new body or runtime appends a revision. After 1.9 the next label is 2.0. Runny keeps the latest 10 revisions.
Open a revision at /s/{slug}/v/{number} when you can view the script.
Restore
Restore copies an old body into a new revision. It does not delete later revisions or rewrite the old one. Concurrent editors can send base_revision; a mismatch is rejected so you do not clobber a newer save.