1+INT((N-1)*u) with u in (0,1) can never reach N, so the IU=N branch
of the RANGE='V' bound in xDRVST has been unreachable since the code
was written. xLARND excludes 0 and 1, so 1+INT(N*u) covers [1,N].
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>