JEP draft: Prepare to make final mean final

I think the one thing that'd be nice is if I could somehow tell the JVM from a class that this class is open for final mutation rather than needing special flags passed into the JVM or special manifests in the Jar. It's often pretty clear to me, as a dev, what I when I need something to have final mutation (generally only with serialization objects).

For example,

    @FinalMutatableByReflection
    class Foo {
      final String bar;
    }

The problem with these various "integrity by default" options is that, in most cases, granting access to one effectively grants access to all. For instance, JNI, agent libraries, and JPMS options can each be used to bypass restrictions, making the separation between them largely illusory. Integrity, as framed here, is ultimately binary.

The unfortunate reality of the "integrity by default" crusade is that applications relying on libraries and tools that modify internals will continue to do so. The JDK hasn’t filled any gaps—it has only made an already delicate situation worse.