diff --git a/lib/reducers/thread-reducer.js b/lib/reducers/thread-reducer.js
index 7b4f2a933..f2cb35297 100644
--- a/lib/reducers/thread-reducer.js
+++ b/lib/reducers/thread-reducer.js
@@ -1,549 +1,526 @@
 // @flow
 
 import _isEqual from 'lodash/fp/isEqual';
 
 import {
   setThreadUnreadStatusActionTypes,
   updateActivityActionTypes,
 } from '../actions/activity-actions';
 import { saveMessagesActionType } from '../actions/message-actions';
 import {
   changeThreadSettingsActionTypes,
   deleteThreadActionTypes,
   newThreadActionTypes,
   removeUsersFromThreadActionTypes,
   changeThreadMemberRolesActionTypes,
   joinThreadActionTypes,
   leaveThreadActionTypes,
   setThreadStoreActionType,
 } from '../actions/thread-actions';
 import {
   logOutActionTypes,
   deleteAccountActionTypes,
   logInActionTypes,
   registerActionTypes,
   updateSubscriptionActionTypes,
 } from '../actions/user-actions';
 import type { BaseAction } from '../types/redux-types';
 import {
   type ClientThreadInconsistencyReportCreationRequest,
   reportTypes,
 } from '../types/report-types';
 import {
   serverRequestTypes,
   processServerRequestsActionType,
 } from '../types/request-types';
 import {
   fullStateSyncActionType,
   incrementalStateSyncActionType,
 } from '../types/socket-types';
 import type {
   RawThreadInfo,
   ThreadStore,
   ThreadStoreOperation,
 } from '../types/thread-types';
 import {
   updateTypes,
   type ClientUpdateInfo,
   processUpdatesActionType,
 } from '../types/update-types';
 import { actionLogger } from '../utils/action-logger';
 import { setNewSessionActionType } from '../utils/action-utils';
 import { getConfig } from '../utils/config';
-import { isDev } from '../utils/dev-utils';
-import { assertObjectsAreEqual } from '../utils/objects';
 import { sanitizeActionSecrets } from '../utils/sanitization';
 
-const PROCESSED_THREAD_STORE_INVARIANTS_DISABLED = !isDev;
-
 function reduceThreadUpdates(
   threadInfos: { +[id: string]: RawThreadInfo },
   payload: {
     +updatesResult: { +newUpdates: $ReadOnlyArray<ClientUpdateInfo>, ... },
     ...
   },
 ): {
   +threadStoreOperations: $ReadOnlyArray<ThreadStoreOperation>,
   +threadInfos: { +[id: string]: RawThreadInfo },
 } {
   const updatedThreadInfos = { ...threadInfos };
   let someThreadUpdated = false;
   const threadOperations: ThreadStoreOperation[] = [];
   for (const update of payload.updatesResult.newUpdates) {
     if (
       (update.type === updateTypes.UPDATE_THREAD ||
         update.type === updateTypes.JOIN_THREAD) &&
       !_isEqual(threadInfos[update.threadInfo.id])(update.threadInfo)
     ) {
       someThreadUpdated = true;
       updatedThreadInfos[update.threadInfo.id] = update.threadInfo;
       threadOperations.push({
         type: 'replace',
         payload: {
           id: update.threadInfo.id,
           threadInfo: update.threadInfo,
         },
       });
     } else if (
       update.type === updateTypes.UPDATE_THREAD_READ_STATUS &&
       threadInfos[update.threadID] &&
       threadInfos[update.threadID].currentUser.unread !== update.unread
     ) {
       someThreadUpdated = true;
       const updatedThread = {
         ...threadInfos[update.threadID],
         currentUser: {
           ...threadInfos[update.threadID].currentUser,
           unread: update.unread,
         },
       };
       updatedThreadInfos[update.threadID] = updatedThread;
       threadOperations.push({
         type: 'replace',
         payload: {
           id: update.threadID,
           threadInfo: updatedThread,
         },
       });
     } else if (
       update.type === updateTypes.DELETE_THREAD &&
       threadInfos[update.threadID]
     ) {
       someThreadUpdated = true;
       delete updatedThreadInfos[update.threadID];
       threadOperations.push({
         type: 'remove',
         payload: {
           ids: [update.threadID],
         },
       });
     } else if (update.type === updateTypes.DELETE_ACCOUNT) {
       for (const threadID in threadInfos) {
         const threadInfo = threadInfos[threadID];
         const newMembers = threadInfo.members.filter(
           member => member.id !== update.deletedUserID,
         );
         if (newMembers.length < threadInfo.members.length) {
           someThreadUpdated = true;
           const updatedThread = {
             ...threadInfo,
             members: newMembers,
           };
           updatedThreadInfos[threadID] = updatedThread;
           threadOperations.push({
             type: 'replace',
             payload: {
               id: threadID,
               threadInfo: updatedThread,
             },
           });
         }
       }
     }
   }
   if (!someThreadUpdated) {
     return { threadStoreOperations: [], threadInfos };
   }
   return {
     threadStoreOperations: threadOperations,
     threadInfos: updatedThreadInfos,
   };
 }
 
 const emptyArray = [];
 function findInconsistencies(
   action: BaseAction,
   beforeStateCheck: { +[id: string]: RawThreadInfo },
   afterStateCheck: { +[id: string]: RawThreadInfo },
 ): ClientThreadInconsistencyReportCreationRequest[] {
   if (_isEqual(beforeStateCheck)(afterStateCheck)) {
     return emptyArray;
   }
   return [
     {
       type: reportTypes.THREAD_INCONSISTENCY,
       platformDetails: getConfig().platformDetails,
       beforeAction: beforeStateCheck,
       action: sanitizeActionSecrets(action),
       pushResult: afterStateCheck,
       lastActions: actionLogger.interestingActionSummaries,
       time: Date.now(),
     },
   ];
 }
 
 function reduceThreadInfos(
   state: ThreadStore,
   action: BaseAction,
 ): {
   threadStore: ThreadStore,
   newThreadInconsistencies: $ReadOnlyArray<ClientThreadInconsistencyReportCreationRequest>,
   threadStoreOperations: $ReadOnlyArray<ThreadStoreOperation>,
 } {
   if (
     action.type === logInActionTypes.success ||
     action.type === registerActionTypes.success ||
     action.type === fullStateSyncActionType
   ) {
     const newThreadInfos = action.payload.threadInfos;
     const threadStoreOperations = [
       {
         type: 'remove_all',
       },
       ...Object.keys(newThreadInfos).map((id: string) => ({
         type: 'replace',
         payload: { id, threadInfo: newThreadInfos[id] },
       })),
     ];
     const updatedThreadStore = processThreadStoreOperations(
       state,
       threadStoreOperations,
     );
     return {
       threadStore: updatedThreadStore,
       newThreadInconsistencies: [],
       threadStoreOperations,
     };
   } else if (
     action.type === logOutActionTypes.success ||
     action.type === deleteAccountActionTypes.success ||
     (action.type === setNewSessionActionType &&
       action.payload.sessionChange.cookieInvalidated)
   ) {
     if (Object.keys(state.threadInfos).length === 0) {
       return {
         threadStore: state,
         newThreadInconsistencies: [],
         threadStoreOperations: [],
       };
     }
     const threadStoreOperations = [
       {
         type: 'remove_all',
       },
     ];
     const updatedThreadStore = processThreadStoreOperations(
       state,
       threadStoreOperations,
     );
     return {
       threadStore: updatedThreadStore,
       newThreadInconsistencies: [],
       threadStoreOperations,
     };
   } else if (
     action.type === joinThreadActionTypes.success ||
     action.type === leaveThreadActionTypes.success ||
     action.type === deleteThreadActionTypes.success ||
     action.type === changeThreadSettingsActionTypes.success ||
     action.type === removeUsersFromThreadActionTypes.success ||
     action.type === changeThreadMemberRolesActionTypes.success ||
     action.type === incrementalStateSyncActionType ||
     action.type === processUpdatesActionType ||
     action.type === newThreadActionTypes.success
   ) {
     if (action.payload.updatesResult.newUpdates.length === 0) {
       return {
         threadStore: state,
         newThreadInconsistencies: [],
         threadStoreOperations: [],
       };
     }
     const { threadStoreOperations } = reduceThreadUpdates(
       state.threadInfos,
       action.payload,
     );
     const updatedThreadStore = processThreadStoreOperations(
       state,
       threadStoreOperations,
     );
     return {
       threadStore: updatedThreadStore,
       newThreadInconsistencies: [],
       threadStoreOperations,
     };
   } else if (action.type === updateSubscriptionActionTypes.success) {
     const newThreadInfo = {
       ...state.threadInfos[action.payload.threadID],
       currentUser: {
         ...state.threadInfos[action.payload.threadID].currentUser,
         subscription: action.payload.subscription,
       },
     };
     const threadStoreOperations = [
       {
         type: 'replace',
         payload: {
           id: action.payload.threadID,
           threadInfo: newThreadInfo,
         },
       },
     ];
     const updatedThreadStore = processThreadStoreOperations(
       state,
       threadStoreOperations,
     );
     return {
       threadStore: updatedThreadStore,
       newThreadInconsistencies: [],
       threadStoreOperations,
     };
   } else if (action.type === saveMessagesActionType) {
     const threadIDToMostRecentTime = new Map();
     for (const messageInfo of action.payload.rawMessageInfos) {
       const current = threadIDToMostRecentTime.get(messageInfo.threadID);
       if (!current || current < messageInfo.time) {
         threadIDToMostRecentTime.set(messageInfo.threadID, messageInfo.time);
       }
     }
     const changedThreadInfos = {};
     for (const [threadID, mostRecentTime] of threadIDToMostRecentTime) {
       const threadInfo = state.threadInfos[threadID];
       if (
         !threadInfo ||
         threadInfo.currentUser.unread ||
         action.payload.updatesCurrentAsOf > mostRecentTime
       ) {
         continue;
       }
       changedThreadInfos[threadID] = {
         ...state.threadInfos[threadID],
         currentUser: {
           ...state.threadInfos[threadID].currentUser,
           unread: true,
         },
       };
     }
     if (Object.keys(changedThreadInfos).length !== 0) {
       const threadStoreOperations = Object.keys(changedThreadInfos).map(id => ({
         type: 'replace',
         payload: {
           id,
           threadInfo: changedThreadInfos[id],
         },
       }));
       const updatedThreadStore = processThreadStoreOperations(
         state,
         threadStoreOperations,
       );
       return {
         threadStore: updatedThreadStore,
         newThreadInconsistencies: [],
         threadStoreOperations,
       };
     }
   } else if (action.type === processServerRequestsActionType) {
     const checkStateRequest = action.payload.serverRequests.find(
       candidate => candidate.type === serverRequestTypes.CHECK_STATE,
     );
     if (!checkStateRequest || !checkStateRequest.stateChanges) {
       return {
         threadStore: state,
         newThreadInconsistencies: [],
         threadStoreOperations: [],
       };
     }
     const { rawThreadInfos, deleteThreadIDs } = checkStateRequest.stateChanges;
     if (!rawThreadInfos && !deleteThreadIDs) {
       return {
         threadStore: state,
         newThreadInconsistencies: [],
         threadStoreOperations: [],
       };
     }
 
     const threadStoreOperations: ThreadStoreOperation[] = [];
     if (rawThreadInfos) {
       for (const rawThreadInfo of rawThreadInfos) {
         threadStoreOperations.push({
           type: 'replace',
           payload: {
             id: rawThreadInfo.id,
             threadInfo: rawThreadInfo,
           },
         });
       }
     }
     if (deleteThreadIDs) {
       threadStoreOperations.push({
         type: 'remove',
         payload: {
           ids: deleteThreadIDs,
         },
       });
     }
 
     const updatedThreadStore = processThreadStoreOperations(
       state,
       threadStoreOperations,
     );
 
     const newThreadInconsistencies = findInconsistencies(
       action,
       state.threadInfos,
       updatedThreadStore.threadInfos,
     );
 
     return {
       threadStore: updatedThreadStore,
       newThreadInconsistencies,
       threadStoreOperations,
     };
   } else if (action.type === updateActivityActionTypes.success) {
     const updatedThreadInfos = {};
     for (const setToUnread of action.payload.result.unfocusedToUnread) {
       const threadInfo = state.threadInfos[setToUnread];
       if (threadInfo && !threadInfo.currentUser.unread) {
         updatedThreadInfos[setToUnread] = {
           ...threadInfo,
           currentUser: {
             ...threadInfo.currentUser,
             unread: true,
           },
         };
       }
     }
     if (Object.keys(updatedThreadInfos).length === 0) {
       return {
         threadStore: state,
         newThreadInconsistencies: [],
         threadStoreOperations: [],
       };
     }
     const threadStoreOperations = Object.keys(updatedThreadInfos).map(id => ({
       type: 'replace',
       payload: {
         id,
         threadInfo: updatedThreadInfos[id],
       },
     }));
     const updatedThreadStore = processThreadStoreOperations(
       state,
       threadStoreOperations,
     );
     return {
       threadStore: updatedThreadStore,
       newThreadInconsistencies: [],
       threadStoreOperations,
     };
   } else if (action.type === setThreadUnreadStatusActionTypes.started) {
     const { threadID, unread } = action.payload;
     const updatedThreadInfo = {
       ...state.threadInfos[threadID],
       currentUser: {
         ...state.threadInfos[threadID].currentUser,
         unread,
       },
     };
     const threadStoreOperations = [
       {
         type: 'replace',
         payload: {
           id: threadID,
           threadInfo: updatedThreadInfo,
         },
       },
     ];
     const updatedThreadStore = processThreadStoreOperations(
       state,
       threadStoreOperations,
     );
     return {
       threadStore: updatedThreadStore,
       newThreadInconsistencies: [],
       threadStoreOperations,
     };
   } else if (action.type === setThreadUnreadStatusActionTypes.success) {
     const { threadID, resetToUnread } = action.payload;
     const currentUser = state.threadInfos[threadID].currentUser;
 
     if (!resetToUnread || currentUser.unread) {
       return {
         threadStore: state,
         newThreadInconsistencies: [],
         threadStoreOperations: [],
       };
     }
 
     const updatedUser = {
       ...currentUser,
       unread: true,
     };
     const updatedThread = {
       ...state.threadInfos[threadID],
       currentUser: updatedUser,
     };
     const threadStoreOperations = [
       {
         type: 'replace',
         payload: {
           id: threadID,
           threadInfo: updatedThread,
         },
       },
     ];
     const updatedThreadStore = processThreadStoreOperations(
       state,
       threadStoreOperations,
     );
     return {
       threadStore: updatedThreadStore,
       newThreadInconsistencies: [],
       threadStoreOperations,
     };
   } else if (action.type === setThreadStoreActionType) {
     return {
       threadStore: action.payload,
       newThreadInconsistencies: [],
       threadStoreOperations: [],
     };
   }
   return {
     threadStore: state,
     newThreadInconsistencies: [],
     threadStoreOperations: [],
   };
 }
 
 function processThreadStoreOperations(
   threadStore: ThreadStore,
   threadStoreOperations: $ReadOnlyArray<ThreadStoreOperation>,
 ): ThreadStore {
   if (threadStoreOperations.length === 0) {
     return threadStore;
   }
   let processedThreads = { ...threadStore.threadInfos };
   for (const operation of threadStoreOperations) {
     if (operation.type === 'replace') {
       processedThreads[operation.payload.id] = operation.payload.threadInfo;
     } else if (operation.type === 'remove') {
       for (const id of operation.payload.ids) {
         delete processedThreads[id];
       }
     } else if (operation.type === 'remove_all') {
       processedThreads = {};
     }
   }
   return { ...threadStore, threadInfos: processedThreads };
 }
 
-function assertThreadStoreThreadsAreEqual(
-  processedThreadStore: ThreadStore,
-  expectedThreadStore: ThreadStore,
-  actionType: string,
-) {
-  if (PROCESSED_THREAD_STORE_INVARIANTS_DISABLED) {
-    return;
-  }
-  assertObjectsAreEqual(
-    processedThreadStore.threadInfos,
-    expectedThreadStore.threadInfos,
-    `ThreadStore.threadInfos - ${actionType}`,
-  );
-}
-
-export {
-  reduceThreadInfos,
-  processThreadStoreOperations,
-  assertThreadStoreThreadsAreEqual,
-};
+export { reduceThreadInfos, processThreadStoreOperations };