[O] Code block eval scope - subtree only option ignored

[Jay Iyer]

Hi, evaluating a simple elisp code block in a subtree, called with C-c C-v
C-s or just C-c C-C, evaluates the entire Org buffer.  Is this expected
behavior?
How can I force the eval on the visible portion (with narrowing) of the
tree only?
Thanks,
-jay