diff --git a/app/javascript/mastodon/actions/store.js b/app/javascript/mastodon/actions/store.js
index 0597d265e..a1db0fdd5 100644
--- a/app/javascript/mastodon/actions/store.js
+++ b/app/javascript/mastodon/actions/store.js
@@ -5,8 +5,7 @@ export const STORE_HYDRATE_LAZY = 'STORE_HYDRATE_LAZY';
 
 const convertState = rawState =>
   fromJS(rawState, (k, v) =>
-    Iterable.isIndexed(v) ? v.toList() : v.toMap().mapKeys(x =>
-      Number.isNaN(x * 1) ? x : x * 1));
+    Iterable.isIndexed(v) ? v.toList() : v.toMap());
 
 export function hydrateStore(rawState) {
   const state = convertState(rawState);
diff --git a/app/javascript/mastodon/components/account.js b/app/javascript/mastodon/components/account.js
index 6456c12ba..d614a52c9 100644
--- a/app/javascript/mastodon/components/account.js
+++ b/app/javascript/mastodon/components/account.js
@@ -21,7 +21,7 @@ export default class Account extends ImmutablePureComponent {
 
   static propTypes = {
     account: ImmutablePropTypes.map.isRequired,
-    me: PropTypes.number.isRequired,
+    me: PropTypes.string.isRequired,
     onFollow: PropTypes.func.isRequired,
     onBlock: PropTypes.func.isRequired,
     onMute: PropTypes.func.isRequired,
diff --git a/app/javascript/mastodon/components/autosuggest_textarea.js b/app/javascript/mastodon/components/autosuggest_textarea.js
index 35b37600f..30e3049df 100644
--- a/app/javascript/mastodon/components/autosuggest_textarea.js
+++ b/app/javascript/mastodon/components/autosuggest_textarea.js
@@ -128,7 +128,7 @@ export default class AutosuggestTextarea extends ImmutablePureComponent {
   }
 
   onSuggestionClick = (e) => {
-    const suggestion = Number(e.currentTarget.getAttribute('data-index'));
+    const suggestion = e.currentTarget.getAttribute('data-index');
     e.preventDefault();
     this.props.onSuggestionSelected(this.state.tokenStart, this.state.lastToken, suggestion);
     this.textarea.focus();
diff --git a/app/javascript/mastodon/components/status.js b/app/javascript/mastodon/components/status.js
index 82359156d..3716d522e 100644
--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@@ -34,7 +34,7 @@ export default class Status extends ImmutablePureComponent {
     onBlock: PropTypes.func,
     onEmbed: PropTypes.func,
     onHeightChange: PropTypes.func,
-    me: PropTypes.number,
+    me: PropTypes.string,
     boostModal: PropTypes.bool,
     autoPlayGif: PropTypes.bool,
     muted: PropTypes.bool,
@@ -70,7 +70,7 @@ export default class Status extends ImmutablePureComponent {
 
   handleAccountClick = (e) => {
     if (this.context.router && e.button === 0) {
-      const id = Number(e.currentTarget.getAttribute('data-id'));
+      const id = e.currentTarget.getAttribute('data-id');
       e.preventDefault();
       this.context.router.history.push(`/accounts/${id}`);
     }
diff --git a/app/javascript/mastodon/components/status_action_bar.js b/app/javascript/mastodon/components/status_action_bar.js
index 692b1ef2b..803b730d9 100644
--- a/app/javascript/mastodon/components/status_action_bar.js
+++ b/app/javascript/mastodon/components/status_action_bar.js
@@ -46,7 +46,7 @@ export default class StatusActionBar extends ImmutablePureComponent {
     onEmbed: PropTypes.func,
     onMuteConversation: PropTypes.func,
     onPin: PropTypes.func,
-    me: PropTypes.number,
+    me: PropTypes.string,
     withDismiss: PropTypes.bool,
     intl: PropTypes.object.isRequired,
   };
diff --git a/app/javascript/mastodon/features/account/components/action_bar.js b/app/javascript/mastodon/features/account/components/action_bar.js
index c12c0889e..9e8fea69d 100644
--- a/app/javascript/mastodon/features/account/components/action_bar.js
+++ b/app/javascript/mastodon/features/account/components/action_bar.js
@@ -26,7 +26,7 @@ export default class ActionBar extends React.PureComponent {
 
   static propTypes = {
     account: ImmutablePropTypes.map.isRequired,
-    me: PropTypes.number.isRequired,
+    me: PropTypes.string.isRequired,
     onFollow: PropTypes.func,
     onBlock: PropTypes.func.isRequired,
     onMention: PropTypes.func.isRequired,
diff --git a/app/javascript/mastodon/features/account/components/header.js b/app/javascript/mastodon/features/account/components/header.js
index 6eb51a5c7..9ee7a56d9 100644
--- a/app/javascript/mastodon/features/account/components/header.js
+++ b/app/javascript/mastodon/features/account/components/header.js
@@ -77,7 +77,7 @@ export default class Header extends ImmutablePureComponent {
 
   static propTypes = {
     account: ImmutablePropTypes.map,
-    me: PropTypes.number.isRequired,
+    me: PropTypes.string.isRequired,
     onFollow: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
     autoPlayGif: PropTypes.bool.isRequired,
diff --git a/app/javascript/mastodon/features/account_gallery/index.js b/app/javascript/mastodon/features/account_gallery/index.js
index 0cfd98f23..2a88addc4 100644
--- a/app/javascript/mastodon/features/account_gallery/index.js
+++ b/app/javascript/mastodon/features/account_gallery/index.js
@@ -16,9 +16,9 @@ import { ScrollContainer } from 'react-router-scroll';
 import LoadMore from '../../components/load_more';
 
 const mapStateToProps = (state, props) => ({
-  medias: getAccountGallery(state, Number(props.params.accountId)),
-  isLoading: state.getIn(['timelines', `account:${Number(props.params.accountId)}:media`, 'isLoading']),
-  hasMore: !!state.getIn(['timelines', `account:${Number(props.params.accountId)}:media`, 'next']),
+  medias: getAccountGallery(state, props.params.accountId),
+  isLoading: state.getIn(['timelines', `account:${props.params.accountId}:media`, 'isLoading']),
+  hasMore: !!state.getIn(['timelines', `account:${props.params.accountId}:media`, 'next']),
   autoPlayGif: state.getIn(['meta', 'auto_play_gif']),
 });
 
@@ -35,20 +35,20 @@ export default class AccountGallery extends ImmutablePureComponent {
   };
 
   componentDidMount () {
-    this.props.dispatch(fetchAccount(Number(this.props.params.accountId)));
-    this.props.dispatch(refreshAccountMediaTimeline(Number(this.props.params.accountId)));
+    this.props.dispatch(fetchAccount(this.props.params.accountId));
+    this.props.dispatch(refreshAccountMediaTimeline(this.props.params.accountId));
   }
 
   componentWillReceiveProps (nextProps) {
     if (nextProps.params.accountId !== this.props.params.accountId && nextProps.params.accountId) {
-      this.props.dispatch(fetchAccount(Number(nextProps.params.accountId)));
-      this.props.dispatch(refreshAccountMediaTimeline(Number(this.props.params.accountId)));
+      this.props.dispatch(fetchAccount(nextProps.params.accountId));
+      this.props.dispatch(refreshAccountMediaTimeline(this.props.params.accountId));
     }
   }
 
   handleScrollToBottom = () => {
     if (this.props.hasMore) {
-      this.props.dispatch(expandAccountMediaTimeline(Number(this.props.params.accountId)));
+      this.props.dispatch(expandAccountMediaTimeline(this.props.params.accountId));
     }
   }
 
diff --git a/app/javascript/mastodon/features/account_timeline/components/header.js b/app/javascript/mastodon/features/account_timeline/components/header.js
index 167a2097e..edfedb864 100644
--- a/app/javascript/mastodon/features/account_timeline/components/header.js
+++ b/app/javascript/mastodon/features/account_timeline/components/header.js
@@ -10,7 +10,7 @@ export default class Header extends ImmutablePureComponent {
 
   static propTypes = {
     account: ImmutablePropTypes.map,
-    me: PropTypes.number.isRequired,
+    me: PropTypes.string.isRequired,
     onFollow: PropTypes.func.isRequired,
     onBlock: PropTypes.func.isRequired,
     onMention: PropTypes.func.isRequired,
diff --git a/app/javascript/mastodon/features/account_timeline/containers/header_container.js b/app/javascript/mastodon/features/account_timeline/containers/header_container.js
index dcee78b3e..ab75b40de 100644
--- a/app/javascript/mastodon/features/account_timeline/containers/header_container.js
+++ b/app/javascript/mastodon/features/account_timeline/containers/header_container.js
@@ -27,7 +27,7 @@ const makeMapStateToProps = () => {
   const getAccount = makeGetAccount();
 
   const mapStateToProps = (state, { accountId }) => ({
-    account: getAccount(state, Number(accountId)),
+    account: getAccount(state, accountId),
     me: state.getIn(['meta', 'me']),
     unfollowModal: state.getIn(['meta', 'unfollow_modal']),
   });
diff --git a/app/javascript/mastodon/features/account_timeline/index.js b/app/javascript/mastodon/features/account_timeline/index.js
index 3c8b63114..fe92216d5 100644
--- a/app/javascript/mastodon/features/account_timeline/index.js
+++ b/app/javascript/mastodon/features/account_timeline/index.js
@@ -13,9 +13,9 @@ import { List as ImmutableList } from 'immutable';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 
 const mapStateToProps = (state, props) => ({
-  statusIds: state.getIn(['timelines', `account:${Number(props.params.accountId)}`, 'items'], ImmutableList()),
-  isLoading: state.getIn(['timelines', `account:${Number(props.params.accountId)}`, 'isLoading']),
-  hasMore: !!state.getIn(['timelines', `account:${Number(props.params.accountId)}`, 'next']),
+  statusIds: state.getIn(['timelines', `account:${props.params.accountId}`, 'items'], ImmutableList()),
+  isLoading: state.getIn(['timelines', `account:${props.params.accountId}`, 'isLoading']),
+  hasMore: !!state.getIn(['timelines', `account:${props.params.accountId}`, 'next']),
   me: state.getIn(['meta', 'me']),
 });
 
@@ -28,24 +28,24 @@ export default class AccountTimeline extends ImmutablePureComponent {
     statusIds: ImmutablePropTypes.list,
     isLoading: PropTypes.bool,
     hasMore: PropTypes.bool,
-    me: PropTypes.number.isRequired,
+    me: PropTypes.string.isRequired,
   };
 
   componentWillMount () {
-    this.props.dispatch(fetchAccount(Number(this.props.params.accountId)));
-    this.props.dispatch(refreshAccountTimeline(Number(this.props.params.accountId)));
+    this.props.dispatch(fetchAccount(this.props.params.accountId));
+    this.props.dispatch(refreshAccountTimeline(this.props.params.accountId));
   }
 
   componentWillReceiveProps (nextProps) {
     if (nextProps.params.accountId !== this.props.params.accountId && nextProps.params.accountId) {
-      this.props.dispatch(fetchAccount(Number(nextProps.params.accountId)));
-      this.props.dispatch(refreshAccountTimeline(Number(nextProps.params.accountId)));
+      this.props.dispatch(fetchAccount(nextProps.params.accountId));
+      this.props.dispatch(refreshAccountTimeline(nextProps.params.accountId));
     }
   }
 
   handleScrollToBottom = () => {
     if (!this.props.isLoading && this.props.hasMore) {
-      this.props.dispatch(expandAccountTimeline(Number(this.props.params.accountId)));
+      this.props.dispatch(expandAccountTimeline(this.props.params.accountId));
     }
   }
 
diff --git a/app/javascript/mastodon/features/compose/components/compose_form.js b/app/javascript/mastodon/features/compose/components/compose_form.js
index f3320a42b..413142d81 100644
--- a/app/javascript/mastodon/features/compose/components/compose_form.js
+++ b/app/javascript/mastodon/features/compose/components/compose_form.js
@@ -42,7 +42,7 @@ export default class ComposeForm extends ImmutablePureComponent {
     preselectDate: PropTypes.instanceOf(Date),
     is_submitting: PropTypes.bool,
     is_uploading: PropTypes.bool,
-    me: PropTypes.number,
+    me: PropTypes.string,
     onChange: PropTypes.func.isRequired,
     onSubmit: PropTypes.func.isRequired,
     onClearSuggestions: PropTypes.func.isRequired,
diff --git a/app/javascript/mastodon/features/compose/components/upload_form.js b/app/javascript/mastodon/features/compose/components/upload_form.js
index 78473dab4..cf2d2658a 100644
--- a/app/javascript/mastodon/features/compose/components/upload_form.js
+++ b/app/javascript/mastodon/features/compose/components/upload_form.js
@@ -21,7 +21,7 @@ export default class UploadForm extends React.PureComponent {
   };
 
   onRemoveFile = (e) => {
-    const id = Number(e.currentTarget.parentElement.getAttribute('data-id'));
+    const id = e.currentTarget.parentElement.getAttribute('data-id');
     this.props.onRemoveFile(id);
   }
 
diff --git a/app/javascript/mastodon/features/favourites/index.js b/app/javascript/mastodon/features/favourites/index.js
index dc8109d16..4dbfefd87 100644
--- a/app/javascript/mastodon/features/favourites/index.js
+++ b/app/javascript/mastodon/features/favourites/index.js
@@ -11,7 +11,7 @@ import ColumnBackButton from '../../components/column_back_button';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 
 const mapStateToProps = (state, props) => ({
-  accountIds: state.getIn(['user_lists', 'favourited_by', Number(props.params.statusId)]),
+  accountIds: state.getIn(['user_lists', 'favourited_by', props.params.statusId]),
 });
 
 @connect(mapStateToProps)
@@ -24,12 +24,12 @@ export default class Favourites extends ImmutablePureComponent {
   };
 
   componentWillMount () {
-    this.props.dispatch(fetchFavourites(Number(this.props.params.statusId)));
+    this.props.dispatch(fetchFavourites(this.props.params.statusId));
   }
 
   componentWillReceiveProps (nextProps) {
     if (nextProps.params.statusId !== this.props.params.statusId && nextProps.params.statusId) {
-      this.props.dispatch(fetchFavourites(Number(nextProps.params.statusId)));
+      this.props.dispatch(fetchFavourites(nextProps.params.statusId));
     }
   }
 
diff --git a/app/javascript/mastodon/features/followers/index.js b/app/javascript/mastodon/features/followers/index.js
index 2d85b9cc0..89445559f 100644
--- a/app/javascript/mastodon/features/followers/index.js
+++ b/app/javascript/mastodon/features/followers/index.js
@@ -17,8 +17,8 @@ import ColumnBackButton from '../../components/column_back_button';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 
 const mapStateToProps = (state, props) => ({
-  accountIds: state.getIn(['user_lists', 'followers', Number(props.params.accountId), 'items']),
-  hasMore: !!state.getIn(['user_lists', 'followers', Number(props.params.accountId), 'next']),
+  accountIds: state.getIn(['user_lists', 'followers', props.params.accountId, 'items']),
+  hasMore: !!state.getIn(['user_lists', 'followers', props.params.accountId, 'next']),
 });
 
 @connect(mapStateToProps)
@@ -32,14 +32,14 @@ export default class Followers extends ImmutablePureComponent {
   };
 
   componentWillMount () {
-    this.props.dispatch(fetchAccount(Number(this.props.params.accountId)));
-    this.props.dispatch(fetchFollowers(Number(this.props.params.accountId)));
+    this.props.dispatch(fetchAccount(this.props.params.accountId));
+    this.props.dispatch(fetchFollowers(this.props.params.accountId));
   }
 
   componentWillReceiveProps (nextProps) {
     if (nextProps.params.accountId !== this.props.params.accountId && nextProps.params.accountId) {
-      this.props.dispatch(fetchAccount(Number(nextProps.params.accountId)));
-      this.props.dispatch(fetchFollowers(Number(nextProps.params.accountId)));
+      this.props.dispatch(fetchAccount(nextProps.params.accountId));
+      this.props.dispatch(fetchFollowers(nextProps.params.accountId));
     }
   }
 
@@ -47,13 +47,13 @@ export default class Followers extends ImmutablePureComponent {
     const { scrollTop, scrollHeight, clientHeight } = e.target;
 
     if (scrollTop === scrollHeight - clientHeight && this.props.hasMore) {
-      this.props.dispatch(expandFollowers(Number(this.props.params.accountId)));
+      this.props.dispatch(expandFollowers(this.props.params.accountId));
     }
   }
 
   handleLoadMore = (e) => {
     e.preventDefault();
-    this.props.dispatch(expandFollowers(Number(this.props.params.accountId)));
+    this.props.dispatch(expandFollowers(this.props.params.accountId));
   }
 
   render () {
diff --git a/app/javascript/mastodon/features/following/index.js b/app/javascript/mastodon/features/following/index.js
index e4e2a4811..c34830276 100644
--- a/app/javascript/mastodon/features/following/index.js
+++ b/app/javascript/mastodon/features/following/index.js
@@ -17,8 +17,8 @@ import ColumnBackButton from '../../components/column_back_button';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 
 const mapStateToProps = (state, props) => ({
-  accountIds: state.getIn(['user_lists', 'following', Number(props.params.accountId), 'items']),
-  hasMore: !!state.getIn(['user_lists', 'following', Number(props.params.accountId), 'next']),
+  accountIds: state.getIn(['user_lists', 'following', props.params.accountId, 'items']),
+  hasMore: !!state.getIn(['user_lists', 'following', props.params.accountId, 'next']),
 });
 
 @connect(mapStateToProps)
@@ -32,14 +32,14 @@ export default class Following extends ImmutablePureComponent {
   };
 
   componentWillMount () {
-    this.props.dispatch(fetchAccount(Number(this.props.params.accountId)));
-    this.props.dispatch(fetchFollowing(Number(this.props.params.accountId)));
+    this.props.dispatch(fetchAccount(this.props.params.accountId));
+    this.props.dispatch(fetchFollowing(this.props.params.accountId));
   }
 
   componentWillReceiveProps (nextProps) {
     if (nextProps.params.accountId !== this.props.params.accountId && nextProps.params.accountId) {
-      this.props.dispatch(fetchAccount(Number(nextProps.params.accountId)));
-      this.props.dispatch(fetchFollowing(Number(nextProps.params.accountId)));
+      this.props.dispatch(fetchAccount(nextProps.params.accountId));
+      this.props.dispatch(fetchFollowing(nextProps.params.accountId));
     }
   }
 
@@ -47,13 +47,13 @@ export default class Following extends ImmutablePureComponent {
     const { scrollTop, scrollHeight, clientHeight } = e.target;
 
     if (scrollTop === scrollHeight - clientHeight && this.props.hasMore) {
-      this.props.dispatch(expandFollowing(Number(this.props.params.accountId)));
+      this.props.dispatch(expandFollowing(this.props.params.accountId));
     }
   }
 
   handleLoadMore = (e) => {
     e.preventDefault();
-    this.props.dispatch(expandFollowing(Number(this.props.params.accountId)));
+    this.props.dispatch(expandFollowing(this.props.params.accountId));
   }
 
   render () {
diff --git a/app/javascript/mastodon/features/reblogs/index.js b/app/javascript/mastodon/features/reblogs/index.js
index dc940ae01..f1904786a 100644
--- a/app/javascript/mastodon/features/reblogs/index.js
+++ b/app/javascript/mastodon/features/reblogs/index.js
@@ -11,7 +11,7 @@ import ColumnBackButton from '../../components/column_back_button';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 
 const mapStateToProps = (state, props) => ({
-  accountIds: state.getIn(['user_lists', 'reblogged_by', Number(props.params.statusId)]),
+  accountIds: state.getIn(['user_lists', 'reblogged_by', props.params.statusId]),
 });
 
 @connect(mapStateToProps)
@@ -24,12 +24,12 @@ export default class Reblogs extends ImmutablePureComponent {
   };
 
   componentWillMount () {
-    this.props.dispatch(fetchReblogs(Number(this.props.params.statusId)));
+    this.props.dispatch(fetchReblogs(this.props.params.statusId));
   }
 
   componentWillReceiveProps(nextProps) {
     if (nextProps.params.statusId !== this.props.params.statusId && nextProps.params.statusId) {
-      this.props.dispatch(fetchReblogs(Number(nextProps.params.statusId)));
+      this.props.dispatch(fetchReblogs(nextProps.params.statusId));
     }
   }
 
diff --git a/app/javascript/mastodon/features/status/components/action_bar.js b/app/javascript/mastodon/features/status/components/action_bar.js
index c303caf10..034cc9854 100644
--- a/app/javascript/mastodon/features/status/components/action_bar.js
+++ b/app/javascript/mastodon/features/status/components/action_bar.js
@@ -36,7 +36,7 @@ export default class ActionBar extends React.PureComponent {
     onReport: PropTypes.func,
     onPin: PropTypes.func,
     onEmbed: PropTypes.func,
-    me: PropTypes.number.isRequired,
+    me: PropTypes.string.isRequired,
     intl: PropTypes.object.isRequired,
   };
 
diff --git a/app/javascript/mastodon/features/status/index.js b/app/javascript/mastodon/features/status/index.js
index c614f6acb..8da6e743c 100644
--- a/app/javascript/mastodon/features/status/index.js
+++ b/app/javascript/mastodon/features/status/index.js
@@ -38,9 +38,9 @@ const makeMapStateToProps = () => {
   const getStatus = makeGetStatus();
 
   const mapStateToProps = (state, props) => ({
-    status: getStatus(state, Number(props.params.statusId)),
-    ancestorsIds: state.getIn(['contexts', 'ancestors', Number(props.params.statusId)]),
-    descendantsIds: state.getIn(['contexts', 'descendants', Number(props.params.statusId)]),
+    status: getStatus(state, props.params.statusId),
+    ancestorsIds: state.getIn(['contexts', 'ancestors', props.params.statusId]),
+    descendantsIds: state.getIn(['contexts', 'descendants', props.params.statusId]),
     me: state.getIn(['meta', 'me']),
     boostModal: state.getIn(['meta', 'boost_modal']),
     deleteModal: state.getIn(['meta', 'delete_modal']),
@@ -64,7 +64,7 @@ export default class Status extends ImmutablePureComponent {
     status: ImmutablePropTypes.map,
     ancestorsIds: ImmutablePropTypes.list,
     descendantsIds: ImmutablePropTypes.list,
-    me: PropTypes.number,
+    me: PropTypes.string,
     boostModal: PropTypes.bool,
     deleteModal: PropTypes.bool,
     autoPlayGif: PropTypes.bool,
@@ -72,12 +72,12 @@ export default class Status extends ImmutablePureComponent {
   };
 
   componentWillMount () {
-    this.props.dispatch(fetchStatus(Number(this.props.params.statusId)));
+    this.props.dispatch(fetchStatus(this.props.params.statusId));
   }
 
   componentWillReceiveProps (nextProps) {
     if (nextProps.params.statusId !== this.props.params.statusId && nextProps.params.statusId) {
-      this.props.dispatch(fetchStatus(Number(nextProps.params.statusId)));
+      this.props.dispatch(fetchStatus(nextProps.params.statusId));
     }
   }
 
diff --git a/app/serializers/initial_state_serializer.rb b/app/serializers/initial_state_serializer.rb
index 32ffcc688..9ee9bd29c 100644
--- a/app/serializers/initial_state_serializer.rb
+++ b/app/serializers/initial_state_serializer.rb
@@ -10,11 +10,11 @@ class InitialStateSerializer < ActiveModel::Serializer
       access_token: object.token,
       locale: I18n.locale,
       domain: Rails.configuration.x.local_domain,
-      admin: object.admin&.id,
+      admin: object.admin&.id&.to_s,
     }
 
     if object.current_account
-      store[:me]             = object.current_account.id
+      store[:me]             = object.current_account.id.to_s
       store[:unfollow_modal] = object.current_account.user.setting_unfollow_modal
       store[:boost_modal]    = object.current_account.user.setting_boost_modal
       store[:delete_modal]   = object.current_account.user.setting_delete_modal
@@ -28,7 +28,7 @@ class InitialStateSerializer < ActiveModel::Serializer
     store = {}
 
     if object.current_account
-      store[:me]                = object.current_account.id
+      store[:me]                = object.current_account.id.to_s
       store[:default_privacy]   = object.current_account.user.setting_default_privacy
       store[:default_sensitive] = object.current_account.user.setting_default_sensitive
     end
@@ -40,8 +40,8 @@ class InitialStateSerializer < ActiveModel::Serializer
 
   def accounts
     store = {}
-    store[object.current_account.id] = ActiveModelSerializers::SerializableResource.new(object.current_account, serializer: REST::AccountSerializer) if object.current_account
-    store[object.admin.id]           = ActiveModelSerializers::SerializableResource.new(object.admin, serializer: REST::AccountSerializer) if object.admin
+    store[object.current_account.id.to_s] = ActiveModelSerializers::SerializableResource.new(object.current_account, serializer: REST::AccountSerializer) if object.current_account
+    store[object.admin.id.to_s]           = ActiveModelSerializers::SerializableResource.new(object.admin, serializer: REST::AccountSerializer) if object.admin
     store
   end
 
diff --git a/app/serializers/rest/account_serializer.rb b/app/serializers/rest/account_serializer.rb
index 012a4fd18..65fdb0308 100644
--- a/app/serializers/rest/account_serializer.rb
+++ b/app/serializers/rest/account_serializer.rb
@@ -7,6 +7,10 @@ class REST::AccountSerializer < ActiveModel::Serializer
              :note, :url, :avatar, :avatar_static, :header, :header_static,
              :followers_count, :following_count, :statuses_count
 
+  def id
+    object.id.to_s
+  end
+
   def note
     Formatter.instance.simplified_format(object)
   end
diff --git a/app/serializers/rest/application_serializer.rb b/app/serializers/rest/application_serializer.rb
index 868a62f1e..5eb03a513 100644
--- a/app/serializers/rest/application_serializer.rb
+++ b/app/serializers/rest/application_serializer.rb
@@ -4,8 +4,12 @@ class REST::ApplicationSerializer < ActiveModel::Serializer
   attributes :id, :name, :website, :redirect_uri,
              :client_id, :client_secret
 
+  def id
+    object.id.to_s
+  end
+
   def client_id
-    object.uid
+    object.uid.to_s
   end
 
   def client_secret
diff --git a/app/serializers/rest/media_attachment_serializer.rb b/app/serializers/rest/media_attachment_serializer.rb
index 31189406a..f6e7c79d1 100644
--- a/app/serializers/rest/media_attachment_serializer.rb
+++ b/app/serializers/rest/media_attachment_serializer.rb
@@ -6,6 +6,10 @@ class REST::MediaAttachmentSerializer < ActiveModel::Serializer
   attributes :id, :type, :url, :preview_url,
              :remote_url, :text_url, :meta
 
+  def id
+    object.id.to_s
+  end
+
   def url
     if object.needs_redownload?
       media_proxy_url(object.id, :original)
diff --git a/app/serializers/rest/notification_serializer.rb b/app/serializers/rest/notification_serializer.rb
index f95d099a3..541a6b8b5 100644
--- a/app/serializers/rest/notification_serializer.rb
+++ b/app/serializers/rest/notification_serializer.rb
@@ -6,6 +6,10 @@ class REST::NotificationSerializer < ActiveModel::Serializer
   belongs_to :from_account, key: :account, serializer: REST::AccountSerializer
   belongs_to :target_status, key: :status, if: :status_type?, serializer: REST::StatusSerializer
 
+  def id
+    object.id.to_s
+  end
+
   def status_type?
     [:favourite, :reblog, :mention].include?(object.type)
   end
diff --git a/app/serializers/rest/relationship_serializer.rb b/app/serializers/rest/relationship_serializer.rb
index 1d431aa1b..998727e37 100644
--- a/app/serializers/rest/relationship_serializer.rb
+++ b/app/serializers/rest/relationship_serializer.rb
@@ -4,6 +4,10 @@ class REST::RelationshipSerializer < ActiveModel::Serializer
   attributes :id, :following, :followed_by, :blocking,
              :muting, :requested, :domain_blocking
 
+  def id
+    object.id.to_s
+  end
+
   def following
     instance_options[:relationships].following[object.id] || false
   end
diff --git a/app/serializers/rest/report_serializer.rb b/app/serializers/rest/report_serializer.rb
index 0c6bd6556..ecb88d653 100644
--- a/app/serializers/rest/report_serializer.rb
+++ b/app/serializers/rest/report_serializer.rb
@@ -2,4 +2,8 @@
 
 class REST::ReportSerializer < ActiveModel::Serializer
   attributes :id, :action_taken
+
+  def id
+    object.id.to_s
+  end
 end
diff --git a/app/serializers/rest/status_serializer.rb b/app/serializers/rest/status_serializer.rb
index 066d65d9e..e0fd1c77e 100644
--- a/app/serializers/rest/status_serializer.rb
+++ b/app/serializers/rest/status_serializer.rb
@@ -19,6 +19,18 @@ class REST::StatusSerializer < ActiveModel::Serializer
   has_many :tags
   has_many :emojis
 
+  def id
+    object.id.to_s
+  end
+
+  def in_reply_to_id
+    object.in_reply_to_id.to_s
+  end
+
+  def in_reply_to_account_id
+    object.in_reply_to_account_id.to_s
+  end
+
   def current_user?
     !current_user.nil?
   end
@@ -82,7 +94,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
     attributes :id, :username, :url, :acct
 
     def id
-      object.account_id
+      object.account_id.to_s
     end
 
     def username
diff --git a/app/services/batched_remove_status_service.rb b/app/services/batched_remove_status_service.rb
index 86eaa5735..e1e845bc0 100644
--- a/app/services/batched_remove_status_service.rb
+++ b/app/services/batched_remove_status_service.rb
@@ -18,7 +18,7 @@ class BatchedRemoveStatusService < BaseService
     @stream_entry_batches  = []
     @salmon_batches        = []
     @activity_json_batches = []
-    @json_payloads         = statuses.map { |s| [s.id, Oj.dump(event: :delete, payload: s.id)] }.to_h
+    @json_payloads         = statuses.map { |s| [s.id, Oj.dump(event: :delete, payload: s.id.to_s)] }.to_h
     @activity_json         = {}
     @activity_xml          = {}
 
diff --git a/app/services/remove_status_service.rb b/app/services/remove_status_service.rb
index 83fc77043..5f45fb3ab 100644
--- a/app/services/remove_status_service.rb
+++ b/app/services/remove_status_service.rb
@@ -4,7 +4,7 @@ class RemoveStatusService < BaseService
   include StreamEntryRenderer
 
   def call(status)
-    @payload      = Oj.dump(event: :delete, payload: status.id)
+    @payload      = Oj.dump(event: :delete, payload: status.id.to_s)
     @status       = status
     @account      = status.account
     @tags         = status.tags.pluck(:name).to_a
diff --git a/spec/controllers/api/v1/accounts/relationships_controller_spec.rb b/spec/controllers/api/v1/accounts/relationships_controller_spec.rb
index a9073b197..431fc2194 100644
--- a/spec/controllers/api/v1/accounts/relationships_controller_spec.rb
+++ b/spec/controllers/api/v1/accounts/relationships_controller_spec.rb
@@ -50,14 +50,14 @@ describe Api::V1::Accounts::RelationshipsController do
         json = body_as_json
 
         expect(json).to be_a Enumerable
-        expect(json.first[:id]).to eq simon.id
+        expect(json.first[:id]).to eq simon.id.to_s
         expect(json.first[:following]).to be true
         expect(json.first[:followed_by]).to be false
         expect(json.first[:muting]).to be false
         expect(json.first[:requested]).to be false
         expect(json.first[:domain_blocking]).to be false
 
-        expect(json.second[:id]).to eq lewis.id
+        expect(json.second[:id]).to eq lewis.id.to_s
         expect(json.second[:following]).to be false
         expect(json.second[:followed_by]).to be true
         expect(json.second[:muting]).to be false
diff --git a/spec/controllers/api/v1/media_controller_spec.rb b/spec/controllers/api/v1/media_controller_spec.rb
index 6bad3f05d..baa22d7e4 100644
--- a/spec/controllers/api/v1/media_controller_spec.rb
+++ b/spec/controllers/api/v1/media_controller_spec.rb
@@ -53,7 +53,7 @@ RSpec.describe Api::V1::MediaController, type: :controller do
       end
 
       it 'returns media ID in JSON' do
-        expect(body_as_json[:id]).to eq MediaAttachment.first.id
+        expect(body_as_json[:id]).to eq MediaAttachment.first.id.to_s
       end
     end
 
@@ -75,7 +75,7 @@ RSpec.describe Api::V1::MediaController, type: :controller do
       end
 
       it 'returns media ID in JSON' do
-        expect(body_as_json[:id]).to eq MediaAttachment.first.id
+        expect(body_as_json[:id]).to eq MediaAttachment.first.id.to_s
       end
     end
 
@@ -97,7 +97,7 @@ RSpec.describe Api::V1::MediaController, type: :controller do
       end
 
       xit 'returns media ID in JSON' do
-        expect(body_as_json[:id]).to eq MediaAttachment.first.id
+        expect(body_as_json[:id]).to eq MediaAttachment.first.id.to_s
       end
     end
   end
diff --git a/spec/controllers/api/v1/statuses/favourites_controller_spec.rb b/spec/controllers/api/v1/statuses/favourites_controller_spec.rb
index 2a029230d..aba7cd458 100644
--- a/spec/controllers/api/v1/statuses/favourites_controller_spec.rb
+++ b/spec/controllers/api/v1/statuses/favourites_controller_spec.rb
@@ -36,7 +36,7 @@ describe Api::V1::Statuses::FavouritesController do
       it 'return json with updated attributes' do
         hash_body = body_as_json
 
-        expect(hash_body[:id]).to eq status.id
+        expect(hash_body[:id]).to eq status.id.to_s
         expect(hash_body[:favourites_count]).to eq 1
         expect(hash_body[:favourited]).to be true
       end
diff --git a/spec/controllers/api/v1/statuses/pins_controller_spec.rb b/spec/controllers/api/v1/statuses/pins_controller_spec.rb
index 2e170da24..79005c9de 100644
--- a/spec/controllers/api/v1/statuses/pins_controller_spec.rb
+++ b/spec/controllers/api/v1/statuses/pins_controller_spec.rb
@@ -32,7 +32,7 @@ describe Api::V1::Statuses::PinsController do
       it 'return json with updated attributes' do
         hash_body = body_as_json
 
-        expect(hash_body[:id]).to eq status.id
+        expect(hash_body[:id]).to eq status.id.to_s
         expect(hash_body[:pinned]).to be true
       end
     end
diff --git a/spec/controllers/api/v1/statuses/reblogs_controller_spec.rb b/spec/controllers/api/v1/statuses/reblogs_controller_spec.rb
index d6d36c1b2..7417ff672 100644
--- a/spec/controllers/api/v1/statuses/reblogs_controller_spec.rb
+++ b/spec/controllers/api/v1/statuses/reblogs_controller_spec.rb
@@ -36,7 +36,7 @@ describe Api::V1::Statuses::ReblogsController do
       it 'return json with updated attributes' do
         hash_body = body_as_json
 
-        expect(hash_body[:reblog][:id]).to eq status.id
+        expect(hash_body[:reblog][:id]).to eq status.id.to_s
         expect(hash_body[:reblog][:reblogs_count]).to eq 1
         expect(hash_body[:reblog][:reblogged]).to be true
       end