Regarding the latest JEP 401 update

[-]

Hello,
First thanks to the expert group and Dan for an update to JEP 401! The
updated version looks very straightforward and actionable.

I have a few comments in mind:
1. Why are method descriptor's types preloaded? They are not part of the
object layout.
2. API support should mention java.lang.reflect.AccessFlag.
3. More value classes aside from Optional can be migrated: OptionalInt,
OptionalDouble, OptionalLong.

Best,
Chen Liang
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