objects where session fell out of scope

need to decide behavior here:

from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base

Base= declarative_base()

class Character(Base):
    __tablename__ = "characters"

    id = Column(Integer, primary_key=True)

s = Session()

c1 = Character()
s.add(c1)

del s
import gc
gc.collect()

assert object_session(c1) is None

s2 = Session()
s2.add(c1)

raises an error ? or implicit detachment from s?

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