 Object map: #set( $monkey.Map = {"banana" : "good", "roast beef" : "bad"})

The RHS can also be a simple arithmetic expression, such as:
Addition: #set( $value = $foo + 1 )
   Subtraction: #set( $value = $bar - 1 )
   Multiplication: #set( $value = $foo * $bar )
   Division: #set( $value = $foo / $bar )
   Remainder: #set( $value = $foo % $bar )

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