Files starting with dot are considered as hidden on Unix systems, and sometimes
are ignored by the tools. For example, Android build tools do not package such
files to the resulting application, which causes Kotlin reflection to fail
there
#KT-7088 Fixed
BuiltinsPackageFragment was only designed to work with a single instance alive.
Because of this, it was creating deserialization subsystem upon initialization.
This was not working perfectly in JS where it was used, because multiple
storage managers, class caches and other components were created for each
package, leading to different concurrency errors and performance hits. Also in
the near future another package fragment will be needed to represent the
built-in package "kotlin.reflect"
Michael Nedzelsky