kotlinx.io.Source -> iu6:
# {"id":"sourceFile","fileName":"Source.kt"}
    int readAtMostTo(byte[],int,int) -> A
    kotlinx.io.Buffer getBuffer() -> b
      # {"id":"com.android.tools.r8.residualsignature","signature":"()Lr90;"}
    boolean request(long) -> i
    void require(long) -> p0
    byte readByte() -> readByte
    boolean exhausted() -> x
