What is the correct way to get object equality? I ...

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[uriel]

What is the correct way to get object equality? I tacked on data to this simple class, but spek is failing:

data class SimplifiedRule(val preFiller : List<String>, val filler : List<String>, val postFiller : List<String>)

java.lang.AssertionError: 
Expected <SimplifiedRule(preFiller=[one], filler=[two, three], postFiller=[four])>, 
actual <SimplifiedRule(preFiller=[one], filler=[two three], postFiller=[four])>.