Bring cloneDeep back

src/core/QueryManager.ts

@@ -26,6 +26,7 @@ import {
   makeUniqueId,
   isDocumentNode,
   isNonNullObject,
+  cloneDeep,
 } from '../utilities';
 import { ApolloError, isApolloError } from '../errors';
 import {
@@ -1037,6 +1038,10 @@ export class QueryManager<TStore> {
   ): Observable<ApolloQueryResult<TData>> {
     const requestId = queryInfo.lastRequestId = this.generateRequestId();
 
+    // Make sure we write the result below using the same options we were given,
+    // even though the input object may have been modified in the meantime.
+    options = cloneDeep(options);
+
     // Performing transformForLink here gives this.cache a chance to fill in
     // missing fragment definitions (for example) before sending this document
     // through the link chain.

src/utilities/common/cloneDeep.ts

@@ -27,7 +27,7 @@ function cloneDeepHelper<T>(val: T, seen?: Map<any, any>): T {
     // possible in all JS environments, so we will assume they exist/work.
     const copy = Object.create(Object.getPrototypeOf(val));
     seen.set(val, copy);
-    Object.keys(val).forEach(key => {
+    Object.keys(val).concat(Object.getOwnPropertySymbols(val) as any).forEach(key => {
       copy[key] = cloneDeepHelper((val as any)[key], seen);
     });
     return copy;