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I think that’s just a typo. Probably should have been “note that ZGC and genZGC are production-ready”.

Probably. But they still write “On a side note, Oracle's ZGC Generational—GenZGC—is not supported in production yet.”

GenZGC is supported on OpenJDK 21 onwards [1].

I also suspect the author meant "humongous" in:

> Shenandoah is location-based, so there are regions, and region sizes, and therefore _homologous_ allocation is a special case to be handled.