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The (goblins actor-lib inbox) module provides an inbox actor
that serves as a message queue. Messages can be written to and read
from the inbox. The inbox can be also be closed to prevent further
messages from accumulating.
When a message is read from the inbox it will return the next message if available. If no message is available it will return a promise. If the inbox is stopped it’ll break all pending unfulfilled promises.
Spawns a new inbox, returning three actors: read, write, and stop actor.