It seems that everyone who is moving from Caché to IRIS have noticed this small change among other, more noticeable ones. But have you noticed that temporary globals mapping rules have been changed as well?
InterSystems IRIS is a Complete Data Platform
InterSystems IRIS gives you everything you need to capture, share, understand, and act upon your organization’s most valuable asset – your data.
As a complete platform, InterSystems IRIS eliminates the need to integrate multiple development technologies. Applications require less code, fewer system resources, and less maintenance.