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The (goblins actor-lib cell) module provides a very handy actor
called a “cell.” Cells are used to store arbitrary data.
New cells are created with the constructor ^cell:
> (define chest (spawn ^cell 'gold))
The current value of a cell can be retrieved by sending an empty message to the cell:
> ($ chest) => gold
The value of a cell can be changed by sending a message containing the new value:
> ($ chest 'sword) > ($ chest) => sword