Switched to deepcopy for session

flask/ctx.py

@@ -11,6 +11,7 @@
 
 import sys
 from functools import update_wrapper
+from copy import deepcopy
 
 from werkzeug.exceptions import HTTPException
 
@@ -152,7 +153,7 @@ def copy_current_request_context(f):
             'when a request context is on the stack.  For instance within '
             'view functions.')
     reqctx = top.copy()
-    reqctx.session = session.copy()
+    reqctx.session = deepcopy(session)
     def wrapper(*args, **kwargs):
         with reqctx:
             return f(*args, **kwargs)

tests/test_reqctx.py

@@ -14,6 +14,8 @@ import pytest
 import flask
 from flask.sessions import SessionInterface
 
+from copy import deepcopy
+
 try:
     from greenlet import greenlet
 except ImportError:
@@ -158,7 +160,7 @@ class TestGreenletContextCopying(object):
         def index():
             flask.session['fizz'] = 'buzz'
             reqctx = flask._request_ctx_stack.top.copy()
-            reqctx.session = flask.session.copy()
+            reqctx.session = deepcopy(flask.session)
 
             def g():
                 assert not flask.request