0.27.0

What's Changed

• Warn about graph tracking self-invalidation by @muukii in #117
• Revert #109 before redesigning tracking reruns by @muukii in #121
• Isolate Observation registrars per node by @muukii in #116
• Preserve tracking invalidation delivery semantics by @muukii in #120

Full Changelog: 0.26.0...0.27.0