[Sqlalchemy-tickets] Issue #3362: metadata doesn't serialize naming convention (zzzeek/sqlalchemy)

[Mike B. <iss...@bi...>]

New issue 3362: metadata doesn't serialize naming convention
https://bitbucket.org/zzzeek/sqlalchemy/issue/3362/metadata-doesnt-serialize-naming

Mike Bayer:


```
#!python

from sqlalchemy import Table, Column, MetaData, Integer
import pickle

m = MetaData(naming_convention={"pk": "%(table_name)s_pk"})
t = Table('t', m, Column('id', Integer, primary_key=True))

m2 = pickle.loads(pickle.dumps(m))

t2a = Table('t2', m, Column('id', Integer, primary_key=True))
t2b = Table('t2', m2, Column('id', Integer, primary_key=True))

assert t2a.primary_key.name == t2b.primary_key.name

```