diff --git a/keyserver/src/scripts/test-threadstore-reductions.js b/keyserver/src/scripts/test-threadstore-reductions.js
index 1dfc857a8..138ede4cb 100644
--- a/keyserver/src/scripts/test-threadstore-reductions.js
+++ b/keyserver/src/scripts/test-threadstore-reductions.js
@@ -1,287 +1,279 @@
 // @flow
 
 import invariant from 'invariant';
 
 import ashoat from 'lib/facts/ashoat.js';
 import type { RawMessageInfo } from 'lib/types/message-types.js';
 import type {
   ThreadPermission,
   ThreadPermissionsInfo,
   ThreadRolePermissionsBlob,
 } from 'lib/types/thread-permission-types.js';
 import { threadTypes } from 'lib/types/thread-types-enum.js';
 import type { RawThreadInfos } from 'lib/types/thread-types.js';
 import { hash } from 'lib/utils/objects.js';
 
 import { main } from './utils.js';
 import { fetchMessageInfos } from '../fetchers/message-fetchers.js';
 import { fetchThreadInfos } from '../fetchers/thread-fetchers.js';
 import { createScriptViewer } from '../session/scripts.js';
 
 const viewer = createScriptViewer(ashoat.id);
 
 const oneWeekAgo = Date.now() - 7 * 24 * 60 * 60 * 1000;
 const messageSelectionCriteria = { joinedThreads: true, newerThan: oneWeekAgo };
 
 async function testThreadStoreReductions() {
   const [{ threadInfos }, { rawMessageInfos }] = await Promise.all([
     fetchThreadInfos(viewer),
     fetchMessageInfos(viewer, messageSelectionCriteria, 1),
   ]);
   const beforeReductions = JSON.stringify(threadInfos);
   const beforeBytes = new Blob([beforeReductions]).size;
   console.log(
     `before reductions, Ashoat's ThreadStore is ${beforeBytes} bytes large`,
   );
 
   const withoutOldSidebars = filterOutOldSidebars(threadInfos, rawMessageInfos);
-  const withoutOldSidebarsString = JSON.stringify(withoutOldSidebars);
-  const withoutOldSidebarsBytes = new Blob([withoutOldSidebarsString]).size;
-  console.log(
-    "after filtering out old sidebars, Ashoat's ThreadStore is " +
-      `${withoutOldSidebarsBytes} bytes large`,
-  );
+  testSolution(withoutOldSidebars, 'Ashoat', 'filtering out old sidebars');
 
   const improvedEncoding = improveEncoding(threadInfos);
-  const improvedEncodingString = JSON.stringify(improvedEncoding);
-  const improvedEncodingBytes = new Blob([improvedEncodingString]).size;
-  console.log(
-    "after improving encoding, Ashoat's ThreadStore is " +
-      `${improvedEncodingBytes} bytes large`,
-  );
+  testSolution(improvedEncoding, 'Ashoat', 'improving encoding');
 
   const afterIsAdminRole = introduceIsAdminRole(threadInfos);
-  const afterIsAdminRoleString = JSON.stringify(afterIsAdminRole);
-  const afterIsAdminRoleBytes = new Blob([afterIsAdminRoleString]).size;
-  console.log(
-    "after introducing isAdminRole, Ashoat's ThreadStore is " +
-      `${afterIsAdminRoleBytes} bytes large`,
-  );
+  testSolution(afterIsAdminRole, 'Ashoat', 'introducing isAdminRole');
 
   const afterRoleStore = introduceThreadRolePermissionsStore(threadInfos);
-  const afterRoleStoreString = JSON.stringify(afterRoleStore);
-  const afterRoleStoreBytes = new Blob([afterRoleStoreString]).size;
+  testSolution(
+    afterRoleStore,
+    'Ashoat',
+    'introducing ThreadRolePermissionsStore',
+  );
+}
+
+function testSolution(blob: mixed, person: string, descriptor: string) {
+  const stringified = JSON.stringify(blob);
+  const numBytes = new Blob([stringified]).size;
   console.log(
-    "after introducing ThreadRolePermissionsStore, Ashoat's ThreadStore is " +
-      `${afterRoleStoreBytes} bytes large`,
+    `after ${descriptor}, ${person}'s ThreadStore is ${numBytes} bytes large`,
   );
 }
 
 function filterOutOldSidebars(
   threadInfos: RawThreadInfos,
   messageInfos: $ReadOnlyArray<RawMessageInfo>,
 ): RawThreadInfos {
   const newestTimePerThread = new Map();
   for (const messageInfo of messageInfos) {
     const { threadID, time } = messageInfo;
     const currentNewest = newestTimePerThread.get(threadID);
     if (!currentNewest || currentNewest < time) {
       newestTimePerThread.set(threadID, time);
     }
   }
 
   const filtered = {};
   for (const threadID in threadInfos) {
     const threadInfo = threadInfos[threadID];
     const latestUpdate = newestTimePerThread.get(threadID);
     if (
       threadInfo.type !== threadTypes.SIDEBAR ||
       (latestUpdate && latestUpdate >= oneWeekAgo)
     ) {
       filtered[threadID] = threadInfo;
     }
   }
   return filtered;
 }
 
 function improveEncoding(threadInfos: RawThreadInfos) {
   const simplifiedThreadStore = {};
   for (const threadID in threadInfos) {
     const threadInfo = threadInfos[threadID];
     const newRoles = {};
     for (const roleID in threadInfo.roles) {
       const role = threadInfo.roles[roleID];
       newRoles[roleID] = {
         ...role,
         permissions: improveThreadRolePermissionsBlobEncoding(role.permissions),
       };
     }
     const smallerThreadInfo = {
       ...threadInfo,
       roles: newRoles,
       members: threadInfo.members.map(member => {
         const { permissions } = member;
         if (!permissions) {
           return member;
         }
         return {
           ...member,
           permissions: improveThreadPermissionsBlobEncoding(member.permissions),
         };
       }),
       currentUser: {
         ...threadInfo.currentUser,
         permissions: improveThreadPermissionsBlobEncoding(
           threadInfo.currentUser.permissions,
         ),
       },
     };
     simplifiedThreadStore[threadID] = smallerThreadInfo;
   }
   return simplifiedThreadStore;
 }
 
 const smallerPermissionConstants = {
   ['know_of']: 'a',
   ['membership']: 'b',
   ['visible']: 'c',
   ['voiced']: 'd',
   ['edit_entries']: 'e',
   ['edit_thread']: 'f',
   ['edit_thread_description']: 'g',
   ['edit_thread_color']: 'h',
   ['delete_thread']: 'i',
   ['create_subthreads']: 'j',
   ['create_sidebars']: 'k',
   ['join_thread']: 'l',
   ['edit_permissions']: 'm',
   ['add_members']: 'n',
   ['remove_members']: 'o',
   ['change_role']: 'p',
   ['leave_thread']: 'q',
   ['react_to_message']: 'r',
   ['edit_message']: 's',
   ['edit_thread_avatar']: 't',
   ['manage_pins']: 'u',
   ['manage_invite_links']: 'v',
 };
 function improveThreadPermissionsBlobEncoding(blob: ThreadPermissionsInfo) {
   const newBlob = {};
   for (const permission in blob) {
     const permissionTyped: ThreadPermission = (permission: any);
     const oldValue = blob[permissionTyped].value;
     if (!oldValue) {
       continue;
     }
     const newKey = smallerPermissionConstants[permission];
     invariant(newKey, `no newKey for ${permission}!`);
     newBlob[newKey] = 1;
   }
   return newBlob;
 }
 
 const smallerThreadPermissionPropagationPrefixes = {
   ['descendant_']: '1',
   ['child_']: '2',
 };
 const smallerThreadPermissionFilterPrefixes = {
   ['open_']: '3',
   ['toplevel_']: '4',
   ['opentoplevel_']: '5',
 };
 function improveThreadRolePermissionsBlobEncoding(
   blob: ThreadRolePermissionsBlob,
 ) {
   const newBlob = {};
   for (const permission in blob) {
     const oldValue = blob[permission];
     if (!oldValue) {
       continue;
     }
 
     let newKey = '';
     let oldKey = permission;
 
     for (const prefix in smallerThreadPermissionPropagationPrefixes) {
       if (!oldKey.startsWith(prefix)) {
         continue;
       }
       oldKey = oldKey.substr(prefix.length);
       newKey += smallerThreadPermissionPropagationPrefixes[prefix];
     }
 
     for (const prefix in smallerThreadPermissionFilterPrefixes) {
       if (!oldKey.startsWith(prefix)) {
         continue;
       }
       oldKey = oldKey.substr(prefix.length);
       newKey += smallerThreadPermissionFilterPrefixes[prefix];
     }
 
     const newPermConstant = smallerPermissionConstants[oldKey];
     invariant(newPermConstant, `no newPermConstant for ${oldKey}!`);
     newKey += newPermConstant;
 
     newBlob[newKey] = 1;
   }
   return newBlob;
 }
 
 function introduceIsAdminRole(threadInfos: RawThreadInfos) {
   const newThreadStore = {};
   for (const threadID in threadInfos) {
     const threadInfo = threadInfos[threadID];
     const newRoles = {};
     for (const roleID in threadInfo.roles) {
       const role = threadInfo.roles[roleID];
       let newRole = role;
       if (!newRole.isDefault) {
         const { isDefault, ...rest } = newRole;
         newRole = rest;
       }
       if (role.name === 'Admins') {
         newRole = {
           ...newRole,
           isAdmin: true,
         };
       }
       newRoles[roleID] = newRole;
     }
     const newThreadInfo = {
       ...threadInfo,
       roles: newRoles,
       members: threadInfo.members.map(member => {
         const { permissions, ...rest } = member;
         return rest;
       }),
     };
     newThreadStore[threadID] = newThreadInfo;
   }
   return newThreadStore;
 }
 
 function introduceThreadRolePermissionsStore(threadInfos: RawThreadInfos) {
   const newThreadStore = {};
   const threadRolePermissionsStore = {};
   for (const threadID in threadInfos) {
     const threadInfo = threadInfos[threadID];
     const newRoles = {};
     for (const roleID in threadInfo.roles) {
       const role = threadInfo.roles[roleID];
       const rolePermissionsHash = hash(role.permissions);
       threadRolePermissionsStore[rolePermissionsHash] = role.permissions;
       newRoles[roleID] = {
         ...role,
         permissions: rolePermissionsHash,
       };
     }
     const { permissions: currentUserPermissions, ...restCurrentUser } =
       threadInfo.currentUser;
     const newThreadInfo = {
       ...threadInfo,
       currentUser: restCurrentUser,
       roles: newRoles,
       members: threadInfo.members.map(member => {
         const { permissions, ...rest } = member;
         return rest;
       }),
     };
     newThreadStore[threadID] = newThreadInfo;
   }
   return {
     threadInfos: newThreadStore,
     rolePermissions: threadRolePermissionsStore,
   };
 }
 
 main([testThreadStoreReductions]);