Change Capture stage and NULL

Well, I just adapted a job where the Change Capture stage is being used. My test data contain NULL as values to be compared against. I was very much surprised that the comparison with NULL results in finding no difference even though - to the best of my knowledge - SQL standard requires that such comparison always return non-equality. I know, DataStage is no SQL database but then again it is a tool heavily (I suspect mainly) being used in connection with SQL databases (at least as of writing this) and thus it would have been nice and straight forward if it followed the SQL standard where applicable.
Please let me know if your experience is with respect to Change Capture stage and NULL is different. My observation is that counter-intuitive to me, that it make me unsure whether I misinterpreted the results.

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