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-rw-r--r--synapse/handlers/register.py7
1 files changed, 5 insertions, 2 deletions
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index a2cf0f6f3e..49b085269b 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -14,8 +14,9 @@
 # limitations under the License.
 
 """Contains functions for registering clients."""
+
 import logging
-from typing import TYPE_CHECKING, List, Optional, Tuple
+from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple
 
 from synapse import types
 from synapse.api.constants import MAX_USERID_LENGTH, EventTypes, JoinRules, LoginType
@@ -152,7 +153,7 @@ class RegistrationHandler(BaseHandler):
         user_type: Optional[str] = None,
         default_display_name: Optional[str] = None,
         address: Optional[str] = None,
-        bind_emails: List[str] = [],
+        bind_emails: Iterable[str] = [],
         by_admin: bool = False,
         user_agent_ips: Optional[List[Tuple[str, str]]] = None,
     ) -> str:
@@ -693,6 +694,8 @@ class RegistrationHandler(BaseHandler):
             access_token: The access token of the newly logged in device, or
                 None if `inhibit_login` enabled.
         """
+        # TODO: 3pid registration can actually happen on the workers. Consider
+        # refactoring it.
         if self.hs.config.worker_app:
             await self._post_registration_client(
                 user_id=user_id, auth_result=auth_result, access_token=access_token