Use WeakMap for curly component capturedArgs instead of symbol-keyed instance properties

packages/@ember/-internals/glimmer/lib/component-managers/curly.ts

@@ -53,8 +53,15 @@ import {
 import ComponentStateBucket from '../utils/curly-component-state-bucket';
 import { processComponentArgs } from '../utils/process-args';
 
-export const ARGS = Symbol('ARGS');
-export const HAS_BLOCK = Symbol('HAS_BLOCK');
+// WeakMap to store capturedArgs for each component instance, avoiding
+// symbol-keyed properties on the instance itself.
+const COMPONENT_ARGS_MAP = new WeakMap<object, CapturedArguments['named']>();
+
+export function getComponentCapturedArgs(
+  component: object
+): CapturedArguments['named'] | undefined {
+  return COMPONENT_ARGS_MAP.get(component);
+}
 
 export const DIRTY_TAG = Symbol('DIRTY_TAG');
 export const IS_DISPATCHING_ATTRS = Symbol('IS_DISPATCHING_ATTRS');
@@ -286,6 +293,11 @@ export default class CurlyComponentManager
     beginUntrackFrame();
     let component = ComponentClass.create(props);
 
+    // Store capturedArgs in a WeakMap keyed by the component instance so that
+    // PROPERTY_DID_CHANGE can look them up without requiring symbol-keyed
+    // properties on the instance.
+    COMPONENT_ARGS_MAP.set(component, capturedArgs);
+
     let finalizer = _instrumentStart('render.component', initialRenderInstrumentDetails, component);
 
     // We become the new parentView for downstream components, so save our

packages/@ember/-internals/glimmer/lib/component.ts

@@ -28,11 +28,11 @@ import type { DirtyableTag } from '@glimmer/validator';
 import { createTag, dirtyTag } from '@glimmer/validator';
 import type { SimpleElement } from '@simple-dom/interface';
 import {
-  ARGS,
   BOUNDS,
   CURLY_COMPONENT_MANAGER,
   DIRTY_TAG,
   IS_DISPATCHING_ATTRS,
+  getComponentCapturedArgs,
 } from './component-managers/curly';
 import { hasDOM } from '@ember/-internals/browser-environment';
 
@@ -1038,7 +1038,7 @@ class Component<S = unknown>
       return;
     }
 
-    let args = (this as any)[ARGS];
+    let args = getComponentCapturedArgs(this);
     let reference = args !== undefined ? args[key] : undefined;
 
     if (reference !== undefined && isUpdatableRef(reference)) {