Issues in "JPMS: Modules in the Java Language and JVM" (2016/12/19)

[Ess Kay]

"JPMS: Modules in the Java Language and JVM" at
http://cr.openjdk.java.net/~mr/jigsaw/spec/lang-vm.html says the the Module
attribute module_version_index and requires_version_index values  "must be
a valid index into the constant_pool table" which must be a
CONSTANT_Utf8_info structure.  However, in reality they both appear to
optionally have a value of 0.  Is this correct?

Also, the ModuleHashes attribute appears in the Java 9 module-info classes
but does not appear in the "JPMS: Modules in the Java Language and JVM".
Is this just an oversight?