Enum validation causes problems with column_property

I'm currently trying to upgrade from 1.0.12 to 1.1.2. There is a problem where the enum validation gets propagated to column property and then fails. Any advice how to work around this for now? Adding validate_strings=False does not help unfortunately.

Error:

LookupError: "#1" is not among the defined enum values

Test Case

import unittest
from sqlalchemy import (Column, Integer)
from sqlalchemy.dialects.postgresql import ENUM
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import (column_property)
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = ("sqlite://")
db = SQLAlchemy(app)

Base = declarative_base()


class Venue(db.Model):
    __tablename__ = 'venue'
    id = Column(Integer, primary_key=True, nullable=False)

    default = Column(
        ENUM('1', name='default_enum'),
        index=True,
        nullable=True
    )
    dashed_default = column_property("#" + default)

db.drop_all()
db.create_all()


class TestSelfJoin(unittest.TestCase):

    def test_self_join(self):

        db.session.add(Venue(default="1"))
        db.session.commit()

        venue = Venue.query.one()
        print venue.default

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