Does IRIS really not mention Cache in its $ZVERSION string?

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Yes, it is true. InterSystems IRIS is a new product and therefore $ZVERSION string is using IRIS word instead of Caché.

Indeed. As a consequence, some of our tools that check $ZV to tell if they're running on the InterSystems platforms or on one of the other M implementations have had to be modified to treat "IRIS" as equivalent to "Cache".