Project Valhalla explainer trends as JEP 401 nears JDK 28

Category: Languages
Status: discussion
Sources: jvm-weekly.com, JEP 401, discussion
Summary: A long explainer on Project Valhalla reached the HN front page (542 points). It tracks the tracked story that JEP 401 (Value Classes and Objects) is set to land as an opt-in preview in JDK 28, letting the JVM flatten value objects that have no identity.
Comments: Discussion centers on the decade-long timeline and whether a JDK 29 preview exit is realistic, echoing Brian Goetz's own caution that it "seems optimistic."
Why it matters: Value classes are the central Valhalla feature and would change how performance-sensitive JVM code represents data.