[PyMOL] Lists vs Tuples inconsistency in cmd.load_cgo()

I spent quite a bit of time last night chasing down the following. This:

  cmd.load_cgo([SPHERE, 0.0, 0.0, 0.0, 1.0], 'a')

puts a sphere on the screen as expected. But this:

  cmd.load_cgo((SPHERE, 0.0, 0.0, 0.0, 1.0), 'a')

seemingly has no effect at all. I.e., if you pass a tuple instead of a
list, your CGO is not displayed. It's an easy mistake to make (supposing it
should be called a mistake), and it's not easy to figure out why your CGO
does not appear.

The reason seems to be an if(PyList_Size(pycgo) test on line 440 of
layer2/ObjectCGO.c in the 0.99 release - at least that's as far as I went
in tracing this.

Is there any reason why a tuple cannot be used here too?

Regards,
Terry