Javadoc
Returns a the set of values that can be used to replace the values
returned from
#getSampleValues(). This method must return an
array with the same length as
#getSampleValues(). The values
returned from this method should not be the same as those returned from
#getSampleValues(). The default implementation constructs a
set of String values and includes a single null value if
#isAllowNullValue() returns
true, and includes two values
that are the same if
#isAllowDuplicateValues() returns
true.