Index parameter of fli:foreign-typed-aref

Hello lispworkers,

Please take a look at the following excerpt from fli-4-4-5:

Signature: foreign-typed-aref type array index => value
Arguments
    type    A type specifier.
    array   A foreign pointer.
    index   A valid vector index for array.

But my observations of

    (setq ptr (fli:allocate-foreign-object :type :short :nelems 10))
    (fli:foreign-typed-aref '(unsigned-byte 16) ptr 0)
    (fli:foreign-typed-aref '(unsigned-byte 16) ptr 1)
    (fli:foreign-typed-aref '(unsigned-byte 8) ptr 0)
    (fli:foreign-typed-aref '(unsigned-byte 8) ptr 1) ...

show that the index parameter works a la the byte-index of sys:typed-aref.
What is the truth?
--
Sincerely,
Dmitriy Ivanov
lisp.ystok.ru