New candidate JEP: 502: Stable Values (Preview)

[Mark Reinhold]

https://openjdk.org/jeps/502

  Summary: Introduce an API for stable values, which are objects that
  hold immutable data.  Stable values are treated as constants by the
  JVM, enabling the same performance optimizations that are enabled
  by declaring a field final.  Compared to final fields, however,
  stable values offer greater flexibility as to the timing of their
  initialization.  This is a preview API.

- Mark