Update meta

text/0000-cell.md → text/1071-cell.md

@@ -11,7 +11,7 @@ teams: # delete teams that aren't relevant
   - steering
   - typescript
 prs:
-  accepted: # Fill this in with the URL for the Proposal RFC PR
+  accepted: https://github.com/emberjs/rfcs/pull/1071
 project-link:
 suite: 
 ---
@@ -140,9 +140,80 @@ const increment => count.current++;
 </template>
 ```
 
+Using private mutable properties providing public read-only access:
+
+```gjs
+export class MyAPI {
+    #state = Cell.create(0);
+
+    get myValue() {
+        return this.#state;
+    }
+
+    doTheThing() {
+        this.#state = secretFunctionFromSomewhere(); 
+    }
+}
+```
+
 
 ### Re-implementing `@tracked` 
 
+For most current ember projects, using the TC39 Stage 1 implementation of decorators:
+
+```js
+function tracked(target, key, { initializer }) {
+  let cells = new WeakMap();
+
+  function getCell(obj) {
+    let cell = cells.get(obj);
+
+    if (cell === undefined) {
+      cell = Cell.create(initializer.call(this), () => false);
+      cells.set(this, cell);
+    }
+
+    return cell;
+  };
+
+  return {
+    get() {
+      return getCell(this).read();
+    },
+
+    set(value) {
+      getCell(this).set(value);
+    },
+  };
+}
+```
+
+<details><summary>Using spec / standards-decorators</summary>
+
+```js
+import { Cell } from '@glimmer/tracking';
+
+export function tracked(target, context) {
+  const { get } = target;
+
+  return {
+    get() {
+      return get.call(this).read();
+    },
+
+    set(value) {
+      get.call(this).set(value);
+    },
+
+    init(value) {
+      return Cell.create(value);
+    },
+  };
+}
+```
+
+</details>
+
 
 ## How we teach this