Are files from 'src' directory in kotline-runtime.jar really used at runtime?

Hello,

in order to be able to run my Kotlin code outside of the IDE I need to include Kotline runtime library with my application so I unpacked kotline-runtime.jar into jar file with my app and it works well. But kotline-runtime.jar contains ‘src’ directory with sources of the standard library. Are these sources really used at runtime? If not why don’t pack them into a separate jar in the distribution and use them in the IDE only?

We initialied tried to have fewer jars, but now it makes sense to separate these two.