Addressed comments

Author: sebmarkbage

packages/react-client/src/ReactFlightClient.js

@@ -766,8 +766,10 @@ function createElement(
         createBlockedChunk(response);
       handler.value = element;
       handler.chunk = blockedChunk;
-      const freeze = Object.freeze.bind(Object, element.props);
-      blockedChunk.then(freeze, freeze);
+      if (__DEV__) {
+        const freeze = Object.freeze.bind(Object, element.props);
+        blockedChunk.then(freeze, freeze);
+      }
       return createLazyChunkWrapper(blockedChunk);
     }
   } else if (__DEV__) {
@@ -1081,7 +1083,6 @@ function parseModelString(
       // A very common symbol.
       if (
         initializingHandler !== null &&
-        isArray(parentObject) &&
         key === '0'
       ) {
         // We we already have an initializing handler and we're abound to enter

packages/react-reconciler/src/ReactFiberBeginWork.js

@@ -4129,7 +4129,7 @@ function beginWork(
     }
     case Throw: {
       // This represents a Component that threw in the reconciliation phase.
-      // So we'll rethrow here. This might be
+      // So we'll rethrow here. This might be a Thenable.
       throw workInProgress.pendingProps;
     }
   }