v1.8.1

Improvements

• Shmem: reduced the size of the Message class (#485)
• Shmem: store reference counts for the unmanaged region messages in a pool in a dedicated memory segment (#484)

Bugfixes

• Fix address clashes in tests (6122010)
• StateMachine: Guard access to subscription containers (fbb6577)

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Contributors: @dennisklein, @ktf, @rbx

Full Changelog: v1.8.0...v1.8.1