Flask and Flask-Babel Exception

test.py

from flask import session
from flask.ext.babel import lazy_gettext
from traceback import format_exc
import os
import pickle

text = lazy_gettext('foo')
repr(text)  # "lu'foo'"
text.value  # u'foo'
text.__getattribute__('value')  # u'foo'

pickle.dump(text, open('lazy.string', 'wb'))
text = pickle.load(open('lazy.string', 'rb'))
os.remove('lazy.string')
repr(text)  # '<_LazyString broken>'

try:
    text.value  # Traceback ... RuntimeError: maximum recursion depth exceeded
except Exception:
    # format_exc()

    try:
        text.__getattribute__('value')  # Traceback ... RuntimeError: maximum recursion depth exceeded in cmp
    except Exception:
        pass  # format_exc()

session['text'] = lazy_gettext('bar')
string = session.serialize()
cookie = session.unserialize(string, session.secret_key)
repr(cookie['text'])  # '<_LazyString broken>'

try:
    cookie['text'].value  # Traceback ... RuntimeError: maximum recursion depth exceeded
except Exception:
    # format_exc()

    try:
        cookie['text'].__getattribute__('value')  # Traceback ... RuntimeError: maximum recursion depth exceeded in cmp
    except Exception:
        pass  # format_exc()