diff --git a/lib/utils/keyserver-call.js b/lib/utils/keyserver-call.js
--- a/lib/utils/keyserver-call.js
+++ b/lib/utils/keyserver-call.js
@@ -19,25 +19,25 @@
 import type { ConnectionStatus } from '../types/socket-types.js';
 import type { CurrentUserInfo } from '../types/user-types.js';
 
-export type CallKeyserverEndpoint<Args: $ReadOnlyArray<mixed>> = (
+export type CallKeyserverEndpoint<Args: mixed> = (
   endpoint: Endpoint,
   input: { +[string]: mixed },
   args: Args,
   options?: ?CallServerEndpointOptions,
 ) => Promise<any>;
 
-export type ActionFunc<Args: $ReadOnlyArray<mixed>, Return> = (
+export type ActionFunc<Args: mixed, Return> = (
   callServerEndpoint: CallKeyserverEndpoint<Args>,
-) => (...Args) => Promise<Return>;
+) => Args => Promise<Return>;
 
-export type KeyserverCallConfig<Args: $ReadOnlyArray<mixed>> =
+export type KeyserverCallConfig<Args: mixed> =
   | { +keyserverSelection: 'fanout' }
   | {
       +keyserverSelection: 'specific',
-      +keyserverIDExtractor: (...Args) => string,
+      +keyserverIDExtractor: Args => string,
     };
 
-export type KeyserverCall<Args: $ReadOnlyArray<mixed>, Return> = {
+export type KeyserverCall<Args: mixed, Return> = {
   +actionFunc: ActionFunc<Args, Return>,
   +config: KeyserverCallConfig<Args>,
 };
@@ -87,7 +87,7 @@
   +keyserverInfos: { +[keyserverID: string]: KeyserverInfo },
 };
 
-export type GetCallKeyserverEndpointParams<Args: $ReadOnlyArray<mixed>> = {
+export type GetCallKeyserverEndpointParams<Args: mixed> = {
   ...BindKeyserverCallParams,
   +keyserverCallConfig: KeyserverCallConfig<Args>,
 };
@@ -102,9 +102,9 @@
     keyserverInfos: { +[keyserverID: string]: KeyserverInfo },
   ) => {
     return _memoize(
-      <Args: $ReadOnlyArray<mixed>, Return>(
+      <Args: mixed, Return>(
         keyserverCall: KeyserverCall<Args, Return>,
-      ): ((...Args) => Promise<Return>) => {
+      ): (Args => Promise<Return>) => {
         const callKeyserverEndpoint = (
           endpoint: Endpoint,
           data: Object,
@@ -142,9 +142,7 @@
             return Promise.all(promises);
           }
 
-          const keyserverID = keyserverCall.config.keyserverIDExtractor(
-            ...args,
-          );
+          const keyserverID = keyserverCall.config.keyserverIDExtractor(args);
           return bindCallKeyserverEndpoint(keyserverID);
         };
 
@@ -154,10 +152,10 @@
   },
 );
 
-function useKeyserverCall<Args: $ReadOnlyArray<mixed>, Return>(
+function useKeyserverCall<Args: mixed, Return>(
   keyserverCall: KeyserverCall<Args, Return>,
   paramOverride?: ?$Shape<BindKeyserverCallParams>,
-): (...Args) => Promise<Return> {
+): Args => Promise<Return> {
   const dispatch = useDispatch();
   const keyserverInfos = useSelector(
     state => state.keyserverStore.keyserverInfos,