Represents the between operator. The left operand to between must be a single value and the right operand must be a
list - this operator returns true if the left operand is between (using the registered comparator) the two elements
in the list. The definition of between being inclusive follows the SQL BETWEEN definition.
Fields inherited from class org.springframework.expression.spel.ast.Operator
Returns a boolean based on whether a value is in the range expressed. The first operand is any value whilst the
second is a list of two values - those two values being the bounds allowed for the first operand (inclusive).