Code block option :results raw does not replace #+RESULTS

[Soapy Smith <soapy-smith@comcast.net>]

Hello-

Here is an example Python code block:

#+begin_src python :results value raw
 a = (1, 2, 3, 4)
 return a
#+end_src

#+RESULTS:
(1, 2, 3, 4)
(1, 2, 3, 4)

The #+RESULT block above is after 2 evaluations.
The default behavior of "replace" is not happening.  The result "stack"
will continue to grow with additional evaluations.

I also confirmed the same behavior with a Clojure code block.

Is this the expected behavior for this option?

Regards,
Greg