> Is sys._base_executable updated after running getpath.py?

It shouldn't be, but site.py might do it.

More likely it's in how getpath.py is handling the environment variable 
overrides. It should be pretty easy to track down and change - the old 
"logic" was certainly not.

If there's a way to add a test for this case as well, that would be 
handy. Way too little documentation here.