One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
For type Number, value comparisons are numeric.
String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A, and a is greater than B. For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters (http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters).
For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
For information on specifying data types in JSON, see JSON Data Format (http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataFormat.html) in the Amazon DynamoDB Developer Guide.