[Python-Dev] PEP 408 -- Standard library __preview__ package

[Stephen J. Turnbull]

Eli Bendersky writes:

 > My point is that if our users accept *this*, in the stable stdlib, I
 > see no reason they won't accept the same happening between __preview__
 > and a graduated module, when they (hopefully) understand the intention
 > of __preview__.

If it doesn't happen with sufficiently high frequency and annoyance
factors to make attempting to use both the __preview__ and graduated
versions in the same code base unacceptable to most users, then
__preview__ is unnecessary, and the PEP should be rejected.