[Python-Dev] Making PyInterpreterState an opaque type

[Jeroen Demeyer]

On 2019-02-19 04:04, Steve Dower wrote:
> Otherwise, the
> internal memory layout becomes part of the public ABI

Of course, the ABI (not API) depends on the internal memory layout. Why 
is this considered a problem? If you want a fixed ABI, use API level (1) 
from my last post. If you want a fixed API but not ABI, use level (2). 
If you really want stuff to be broken at any time, use (3) or (4). This 
is why I don't see the need to make a difference between (3) and (4): 
neither of them makes any guarantees about stability.