Patches look good to me, so a positive review from me for Simon's patches.
I've attached a further patch to clean up some more details. Doctests pass for me, but Simon should look at it and decide if he's happy with it. Please go ahead and amend as you see necessary. I also have no problem with the patches being unified (we have some very small patches here now)
Apply trac_13447-consolidated_refcount.patch trac_13447-modulus_fix.patch trac_13447-rely_on_singular_refcount.patch trac_13447-refcount_cleanup.patch
