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The main changes are in jvm_package_table.proto and ModuleMapping.kt. With JvmPackageName, package parts can now have a JVM package name that differs from their Kotlin name. So, in addition to the old package parts which were stored as short names + short name of multifile facade (we can't change this because of compatibility with old compilers), we now store separately those package parts, which have a different JVM package name. The format is optimized to avoid storing any package name more than once as a string. Another notable change is in KotlinCliJavaFileManagerImpl, where we now load .kotlin_module files when determining whether or not a package exists. Before this change, no PsiPackage (and thus, no JavaPackage and eventually, no LazyJavaPackageFragment) was created unless there was at least one file in the corresponding directory. Now we also create packages if they are "mapped" to other JVM packages, i.e. if all package parts in them have been annotated with JvmPackageName. Most of the other changes are refactorings to allow internal names of package parts/multifile classes where previously there were only short names.