Why is the Java statement

public static final long  SIGN_BIT_MASK  = 0x8000000000000000L;

a perfectly legal statement and its Kotlin counterpart

const val SIGN_BIT_MASK: Long = 0x8000000000000000L

results in an error? (Value out of range.) Such inconsistencies make it very difficult to port any Math libraries from Java to Kotlin.

You might want to try ULong in the Kotlin code which is unsigned. I think it is a bit of inconsisteny on the Java side that long may be unsigned or signed while other types are signed by default.

Thanks, I’ll give ULong a try.