[Python-Dev] Python 3.4, marshal dumps slower (version 3 protocol)

[Serhiy Storchaka]

27.01.14 17:35, Victor Stinner написав(ла):
> Python 3.4 has two new versions: 3 and 4. The version 3 "shares common
> object references", the version 4 adds short tuples and short strings
> (produce smaller files).

Why we need two new versions added in one Python release?