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unity-async-patterns
Unity async and coroutine correctness patterns. Catches common mistakes with Awaitable double-await, missing cancellation tokens, thread context after BackgroundThreadAsync, coroutine error swallowing, batch mode WaitForEndOfFrame, and Addressables handle leaks. PATTERN format: W
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Unity async and coroutine correctness patterns. Catches common mistakes with Awaitable double-await, missing cancellation tokens, thread context after BackgroundThreadAsync, coroutine error swallowing, batch mode WaitForEndOfFrame, and Addressables handle leaks. PATTERN format: WHEN/WRONG/RIGHT/GOTCHA. Based on Unity 6.3 LTS documentation.
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Async & Coroutine Patterns -- Correctness Patterns
Prerequisite skills:
unity-scripting(coroutines, Awaitable API, yield types),unity-lifecycle(destruction timing, destroyCancellationToken)
These patterns target async bugs that are especially dangerous because they often work during testing and fail in production: exceptions silently swallowed, objects destroyed mid-await, and thread context violations.
PATTERN: Awaitable Double-Await
WHEN: Storing an Awaitable instance and awaiting it more than once
WRONG (Claude default):
Awaitable task = Awaitable.WaitForSecondsAsync(2f);
await task; // First await -- works
await task; // Second await -- UNDEFINED BEHAVIOR (may complete instantly or throw)
RIGHT:
// Awaitable is POOLED -- after the first await completes, the instance is recycled
// Each Awaitable should be awaited exactly once
// If you need to await the same operation from multiple places, use .AsTask():
var task = Awaitable.WaitForSecondsAsync(2f).AsTask();
await task; // Works
await task; // Works -- Task is not pooled
// Or simply create separate Awaitables:
await Awaitable.WaitForSecondsAsync(2f);
await Awaitable.WaitForSecondsAsync(2f); // Fresh instance
GOTCHA: Unity pools Awaitable instances to avoid allocation. After completion, the instance is returned to the pool and may be reused by a completely different operation. A second await on the same instance may see a different operation's state, complete instantly, or throw. This is unlike Task which can be safely awaited multiple times. Use .AsTask() when you need multi-await semantics, but be aware this allocates.
PATTERN: Missing destroyCancellationToken
WHEN: Writing async methods in MonoBehaviours
WRONG (Claude default):
async Awaitable Start()
{
await Awaitable.WaitForSecondsAsync(5f);
// If object was destroyed during the wait:
// - MissingReferenceException on next Unity API call
// - Or worse: silently operates on a "fake-null" object
transform.position = Vector3.zero;
}
RIGHT:
async Awaitable Start()
{
try
{
await Awaitable.WaitForSecondsAsync(5f, destroyCancellationToken);
transform.position = Vector3.zero;
}
catch (OperationCanceledException)
{
// Object was destroyed -- this is expected, not an error
}
}
// For methods that chain multiple awaits:
async Awaitable DoMultiStepWork()
{
var token = destroyCancellationToken;
await Awaitable.NextFrameAsync(token);
ProcessStep1();
await Awaitable.WaitForSecondsAsync(1f, token);
ProcessStep2(); // Safe: would have thrown before reaching here if destroyed
await LoadAssetAsync(token);
ProcessStep3();
}
GOTCHA: destroyCancellationToken is a property on MonoBehaviour that triggers when OnDestroy begins. Every Awaitable wait method accepts an optional CancellationToken. Without it, the await completes normally even after the object is destroyed, leading to MissingReferenceException. Always pass the token AND catch OperationCanceledException.
PATTERN: Thread Context After BackgroundThreadAsync
WHEN: Returning to Unity APIs after doing work on a background thread
WRONG (Claude default):
async Awaitable ProcessData()
{
await Awaitable.BackgroundThreadAsync();
var result = HeavyComputation(); // OK: runs on background thread
// CRASH: Accessing Unity API from background thread
transform.position = new Vector3(result, 0, 0);
}
RIGHT:
async Awaitable ProcessData()
{
await Awaitable.BackgroundThreadAsync();
var result = HeavyComputation(); // Runs on background thread
await Awaitable.MainThreadAsync(); // Switch BACK to main thread
transform.position = new Vector3(result, 0, 0); // Now safe
// Can switch back and forth:
await Awaitable.BackgroundThreadAsync();
var moreData = AnotherHeavyTask();
await Awaitable.MainThreadAsync();
ApplyResults(moreData);
}
GOTCHA: After BackgroundThreadAsync(), ALL subsequent code runs on a thread pool thread until you explicitly switch back with MainThreadAsync(). Unity APIs (Transform, GameObject, Physics, etc.) are not thread-safe and will throw or corrupt state if called from a background thread. MainThreadAsync() resumes on the next frame's player loop update, not immediately.
PATTERN: Coroutine Error Swallowing
WHEN: Exceptions occur inside coroutines
WRONG (Claude default):
IEnumerator LoadAndProcess()
{
yield return LoadData(); // If this throws, coroutine silently stops
ProcessData(); // Never reached, no error in console (or just a log, no stack)
}
// try/catch doesn't work with yield:
IEnumerator BadErrorHandling()
{
try
{
yield return SomethingDangerous(); // COMPILER ERROR: cannot yield in try block with catch
}
catch (Exception e)
{
Debug.LogError(e);
}
}
RIGHT:
// Option 1: Use Awaitable instead (proper exception propagation)
async Awaitable LoadAndProcess()
{
try
{
await LoadDataAsync();
ProcessData();
}
catch (Exception e)
{
Debug.LogError($"Load failed: {e}");
}
}
// Option 2: Error handling without yield in the try block
IEnumerator LoadAndProcessCoroutine()
{
bool success = false;
Exception error = null;
// Wrap the yield outside try/catch
yield return LoadDataCoroutine(result =>
{
success = true;
});
// Handle errors after the yield
if (!success)
{
Debug.LogError("Load failed");
yield break;
}
ProcessData();
}
GOTCHA: In coroutines, yield return cannot appear inside a try block that has a catch clause (C# language restriction). Exceptions in yielded coroutines are logged to the console but execution silently stops -- no propagation to the caller. The caller's coroutine continues as if the nested one completed. Use Awaitable for any operation that can fail and needs error handling.
PATTERN: WaitForEndOfFrame in Batch Mode
WHEN: Using WaitForEndOfFrame or Awaitable.EndOfFrameAsync in headless/server/test environments
WRONG (Claude default):
IEnumerator CaptureScreenshot()
{
yield return new WaitForEndOfFrame(); // HANGS in batch mode (no rendering)
var tex = ScreenCapture.CaptureScreenshotAsTexture();
}
// Same issue with Awaitable:
async Awaitable WaitForRender()
{
await Awaitable.EndOfFrameAsync(); // HANGS in batch mode
}
RIGHT:
IEnumerator CaptureScreenshot()
{
// Check if we're in batch mode
if (Application.isBatchMode)
{
yield return null; // Just wait one frame instead
Debug.LogWarning("Screenshot not available in batch mode");
yield break;
}
yield return new WaitForEndOfFrame();
var tex = ScreenCapture.CaptureScreenshotAsTexture();
}
// For tests that need frame advancement without rendering:
IEnumerator TestCoroutine()
{
yield return null; // Advances one frame (works in all modes)
// yield return new WaitForFixedUpdate(); // Also works in batch mode
}
GOTCHA: WaitForEndOfFrame and EndOfFrameAsync wait for the rendering phase. In batch mode (-batchmode flag), headless servers, and some test runners, there is no rendering -- so these yields never complete and the coroutine/async hangs forever. Use yield return null (next Update) or Awaitable.NextFrameAsync() for frame advancement that works everywhere.
PATTERN: Nested Coroutine Cancellation
WHEN: Stopping a parent coroutine that launched child coroutines
WRONG (Claude default):
Coroutine _mainRoutine;
void Start()
{
_mainRoutine = StartCoroutine(MainLoop());
}
IEnumerator MainLoop()
{
StartCoroutine(SubTaskA()); // Launched independently
StartCoroutine(SubTaskB()); // Launched independently
yield return new WaitForSeconds(10f);
}
void Cancel()
{
StopCoroutine(_mainRoutine);
// SubTaskA and SubTaskB continue running!
}
RIGHT:
private Coroutine _mainRoutine;
private Coroutine _subA;
private Coroutine _subB;
IEnumerator MainLoop()
{
_subA = StartCoroutine(SubTaskA());
_subB = StartCoroutine(SubTaskB());
yield return new WaitForSeconds(10f);
}
void Cancel()
{
// Must stop each coroutine individually
if (_mainRoutine != null) StopCoroutine(_mainRoutine);
if (_subA != null) StopCoroutine(_subA);
if (_subB != null) StopCoroutine(_subB);
}
// Better: yield return child coroutines (parent owns them)
IEnumerator MainLoopBetter()
{
yield return StartCoroutine(SubTaskA()); // Waits for A, then...
yield return StartCoroutine(SubTaskB()); // Waits for B
// Stopping MainLoopBetter also stops the currently-yielded child
}
GOTCHA: StartCoroutine(SubTask()) launches an independent coroutine. StopCoroutine only stops the specified coroutine. BUT: yield return StartCoroutine(SubTask()) makes the parent wait for the child, and stopping the parent also stops the yielded child. The key distinction: StartCoroutine without yield return = fire-and-forget; with yield return = owned by parent. For complex cancellation trees, prefer Awaitable with CancellationToken.
PATTERN: async void vs async Awaitable
WHEN: Declaring async methods in Unity scripts
WRONG (Claude default):
// async void: exceptions crash the application with no way to catch them
async void DoWork()
{
await Awaitable.WaitForSecondsAsync(1f);
throw new Exception("oops"); // UNHANDLED -- crashes the app
}
void Start()
{
DoWork(); // No way to catch the exception from here
}
RIGHT:
// async Awaitable: proper exception propagation
async Awaitable DoWork()
{
await Awaitable.WaitForSecondsAsync(1f);
throw new Exception("oops"); // Propagates to caller
}
async Awaitable Start()
{
try
{
await DoWork(); // Exception caught here
}
catch (Exception e)
{
Debug.LogError($"Work failed: {e.Message}");
}
}
// async void is ONLY acceptable for Unity event handlers that require void:
// - Button.onClick handlers
// - UnityEvent callbacks
// Even then, wrap the body in try/catch:
async void OnButtonClicked()
{
try
{
await SaveGameAsync();
}
catch (Exception e)
{
Debug.LogError(e);
}
}
GOTCHA: async void methods propagate exceptions to the SynchronizationContext, which in Unity logs them and potentially crashes. async Awaitable methods propagate exceptions to the awaiter, allowing proper try/catch. Unity's lifecycle methods (Start, OnEnable, etc.) can return Awaitable -- prefer this over void when using async.
PATTERN: Concurrent Awaitable Race Conditions
WHEN: Multiple async operations modify shared state
WRONG (Claude default):
// Two async methods writing to the same field
async Awaitable OnClickSearch(string query)
{
var results = await SearchAsync(query); // User types "cat"
_displayedResults = results; // Race: which query wins?
}
// User clicks twice quickly: "cat" then "dog"
// If "dog" returns first, "cat" results overwrite "dog" results
RIGHT:
private CancellationTokenSource _searchCts;
async Awaitable OnClickSearch(string query)
{
// Cancel the previous search
_searchCts?.Cancel();
_searchCts?.Dispose();
_searchCts = new CancellationTokenSource();
var token = _searchCts.Token;
try
Metadatos del archivo
name: unity-async-patterns description: > Unity async and coroutine correctness patterns. Catches common mistakes with Awaitable double-await, missing cancellation tokens, thread context after BackgroundThreadAsync, coroutine error swallowing, batch mode WaitForEndOfFrame, and Addressables handle leaks. PATTERN format: WHEN/WRONG/RIGHT/GOTCHA. Based on Unity 6.3 LTS documentation. globs: - "**/*.cs"
Ver texto original
---
name: unity-async-patterns
description: >
Unity async and coroutine correctness patterns. Catches common mistakes with Awaitable
double-await, missing cancellation tokens, thread context after BackgroundThreadAsync,
coroutine error swallowing, batch mode WaitForEndOfFrame, and Addressables handle leaks.
PATTERN format: WHEN/WRONG/RIGHT/GOTCHA. Based on Unity 6.3 LTS documentation.
globs:
- "**/*.cs"
---
# Async & Coroutine Patterns -- Correctness Patterns
> **Prerequisite skills:** `unity-scripting` (coroutines, Awaitable API, yield types), `unity-lifecycle` (destruction timing, destroyCancellationToken)
These patterns target async bugs that are especially dangerous because they often work during testing and fail in production: exceptions silently swallowed, objects destroyed mid-await, and thread context violations.
---
## PATTERN: Awaitable Double-Await
WHEN: Storing an `Awaitable` instance and awaiting it more than once
WRONG (Claude default):
```csharp
Awaitable task = Awaitable.WaitForSecondsAsync(2f);
await task; // First await -- works
await task; // Second await -- UNDEFINED BEHAVIOR (may complete instantly or throw)
```
RIGHT:
```csharp
// Awaitable is POOLED -- after the first await completes, the instance is recycled
// Each Awaitable should be awaited exactly once
// If you need to await the same operation from multiple places, use .AsTask():
var task = Awaitable.WaitForSecondsAsync(2f).AsTask();
await task; // Works
await task; // Works -- Task is not pooled
// Or simply create separate Awaitables:
await Awaitable.WaitForSecondsAsync(2f);
await Awaitable.WaitForSecondsAsync(2f); // Fresh instance
```
GOTCHA: Unity pools `Awaitable` instances to avoid allocation. After completion, the instance is returned to the pool and may be reused by a completely different operation. A second `await` on the same instance may see a different operation's state, complete instantly, or throw. This is unlike `Task` which can be safely awaited multiple times. Use `.AsTask()` when you need multi-await semantics, but be aware this allocates.
---
## PATTERN: Missing destroyCancellationToken
WHEN: Writing async methods in MonoBehaviours
WRONG (Claude default):
```csharp
async Awaitable Start()
{
await Awaitable.WaitForSecondsAsync(5f);
// If object was destroyed during the wait:
// - MissingReferenceException on next Unity API call
// - Or worse: silently operates on a "fake-null" object
transform.position = Vector3.zero;
}
```
RIGHT:
```csharp
async Awaitable Start()
{
try
{
await Awaitable.WaitForSecondsAsync(5f, destroyCancellationToken);
transform.position = Vector3.zero;
}
catch (OperationCanceledException)
{
// Object was destroyed -- this is expected, not an error
}
}
// For methods that chain multiple awaits:
async Awaitable DoMultiStepWork()
{
var token = destroyCancellationToken;
await Awaitable.NextFrameAsync(token);
ProcessStep1();
await Awaitable.WaitForSecondsAsync(1f, token);
ProcessStep2(); // Safe: would have thrown before reaching here if destroyed
await LoadAssetAsync(token);
ProcessStep3();
}
```
GOTCHA: `destroyCancellationToken` is a property on `MonoBehaviour` that triggers when `OnDestroy` begins. Every `Awaitable` wait method accepts an optional `CancellationToken`. Without it, the await completes normally even after the object is destroyed, leading to `MissingReferenceException`. Always pass the token AND catch `OperationCanceledException`.
---
## PATTERN: Thread Context After BackgroundThreadAsync
WHEN: Returning to Unity APIs after doing work on a background thread
WRONG (Claude default):
```csharp
async Awaitable ProcessData()
{
await Awaitable.BackgroundThreadAsync();
var result = HeavyComputation(); // OK: runs on background thread
// CRASH: Accessing Unity API from background thread
transform.position = new Vector3(result, 0, 0);
}
```
RIGHT:
```csharp
async Awaitable ProcessData()
{
await Awaitable.BackgroundThreadAsync();
var result = HeavyComputation(); // Runs on background thread
await Awaitable.MainThreadAsync(); // Switch BACK to main thread
transform.position = new Vector3(result, 0, 0); // Now safe
// Can switch back and forth:
await Awaitable.BackgroundThreadAsync();
var moreData = AnotherHeavyTask();
await Awaitable.MainThreadAsync();
ApplyResults(moreData);
}
```
GOTCHA: After `BackgroundThreadAsync()`, ALL subsequent code runs on a thread pool thread until you explicitly switch back with `MainThreadAsync()`. Unity APIs (Transform, GameObject, Physics, etc.) are **not thread-safe** and will throw or corrupt state if called from a background thread. `MainThreadAsync()` resumes on the next frame's player loop update, not immediately.
---
## PATTERN: Coroutine Error Swallowing
WHEN: Exceptions occur inside coroutines
WRONG (Claude default):
```csharp
IEnumerator LoadAndProcess()
{
yield return LoadData(); // If this throws, coroutine silently stops
ProcessData(); // Never reached, no error in console (or just a log, no stack)
}
// try/catch doesn't work with yield:
IEnumerator BadErrorHandling()
{
try
{
yield return SomethingDangerous(); // COMPILER ERROR: cannot yield in try block with catch
}
catch (Exception e)
{
Debug.LogError(e);
}
}
```
RIGHT:
```csharp
// Option 1: Use Awaitable instead (proper exception propagation)
async Awaitable LoadAndProcess()
{
try
{
await LoadDataAsync();
ProcessData();
}
catch (Exception e)
{
Debug.LogError($"Load failed: {e}");
}
}
// Option 2: Error handling without yield in the try block
IEnumerator LoadAndProcessCoroutine()
{
bool success = false;
Exception error = null;
// Wrap the yield outside try/catch
yield return LoadDataCoroutine(result =>
{
success = true;
});
// Handle errors after the yield
if (!success)
{
Debug.LogError("Load failed");
yield break;
}
ProcessData();
}
```
GOTCHA: In coroutines, `yield return` cannot appear inside a `try` block that has a `catch` clause (C# language restriction). Exceptions in yielded coroutines are logged to the console but execution silently stops -- no propagation to the caller. The caller's coroutine continues as if the nested one completed. Use `Awaitable` for any operation that can fail and needs error handling.
---
## PATTERN: WaitForEndOfFrame in Batch Mode
WHEN: Using `WaitForEndOfFrame` or `Awaitable.EndOfFrameAsync` in headless/server/test environments
WRONG (Claude default):
```csharp
IEnumerator CaptureScreenshot()
{
yield return new WaitForEndOfFrame(); // HANGS in batch mode (no rendering)
var tex = ScreenCapture.CaptureScreenshotAsTexture();
}
// Same issue with Awaitable:
async Awaitable WaitForRender()
{
await Awaitable.EndOfFrameAsync(); // HANGS in batch mode
}
```
RIGHT:
```csharp
IEnumerator CaptureScreenshot()
{
// Check if we're in batch mode
if (Application.isBatchMode)
{
yield return null; // Just wait one frame instead
Debug.LogWarning("Screenshot not available in batch mode");
yield break;
}
yield return new WaitForEndOfFrame();
var tex = ScreenCapture.CaptureScreenshotAsTexture();
}
// For tests that need frame advancement without rendering:
IEnumerator TestCoroutine()
{
yield return null; // Advances one frame (works in all modes)
// yield return new WaitForFixedUpdate(); // Also works in batch mode
}
```
GOTCHA: `WaitForEndOfFrame` and `EndOfFrameAsync` wait for the rendering phase. In batch mode (`-batchmode` flag), headless servers, and some test runners, there is no rendering -- so these yields never complete and the coroutine/async hangs forever. Use `yield return null` (next Update) or `Awaitable.NextFrameAsync()` for frame advancement that works everywhere.
---
## PATTERN: Nested Coroutine Cancellation
WHEN: Stopping a parent coroutine that launched child coroutines
WRONG (Claude default):
```csharp
Coroutine _mainRoutine;
void Start()
{
_mainRoutine = StartCoroutine(MainLoop());
}
IEnumerator MainLoop()
{
StartCoroutine(SubTaskA()); // Launched independently
StartCoroutine(SubTaskB()); // Launched independently
yield return new WaitForSeconds(10f);
}
void Cancel()
{
StopCoroutine(_mainRoutine);
// SubTaskA and SubTaskB continue running!
}
```
RIGHT:
```csharp
private Coroutine _mainRoutine;
private Coroutine _subA;
private Coroutine _subB;
IEnumerator MainLoop()
{
_subA = StartCoroutine(SubTaskA());
_subB = StartCoroutine(SubTaskB());
yield return new WaitForSeconds(10f);
}
void Cancel()
{
// Must stop each coroutine individually
if (_mainRoutine != null) StopCoroutine(_mainRoutine);
if (_subA != null) StopCoroutine(_subA);
if (_subB != null) StopCoroutine(_subB);
}
// Better: yield return child coroutines (parent owns them)
IEnumerator MainLoopBetter()
{
yield return StartCoroutine(SubTaskA()); // Waits for A, then...
yield return StartCoroutine(SubTaskB()); // Waits for B
// Stopping MainLoopBetter also stops the currently-yielded child
}
```
GOTCHA: `StartCoroutine(SubTask())` launches an **independent** coroutine. `StopCoroutine` only stops the specified coroutine. BUT: `yield return StartCoroutine(SubTask())` makes the parent wait for the child, and stopping the parent also stops the yielded child. The key distinction: `StartCoroutine` without `yield return` = fire-and-forget; with `yield return` = owned by parent. For complex cancellation trees, prefer `Awaitable` with `CancellationToken`.
---
## PATTERN: async void vs async Awaitable
WHEN: Declaring async methods in Unity scripts
WRONG (Claude default):
```csharp
// async void: exceptions crash the application with no way to catch them
async void DoWork()
{
await Awaitable.WaitForSecondsAsync(1f);
throw new Exception("oops"); // UNHANDLED -- crashes the app
}
void Start()
{
DoWork(); // No way to catch the exception from here
}
```
RIGHT:
```csharp
// async Awaitable: proper exception propagation
async Awaitable DoWork()
{
await Awaitable.WaitForSecondsAsync(1f);
throw new Exception("oops"); // Propagates to caller
}
async Awaitable Start()
{
try
{
await DoWork(); // Exception caught here
}
catch (Exception e)
{
Debug.LogError($"Work failed: {e.Message}");
}
}
// async void is ONLY acceptable for Unity event handlers that require void:
// - Button.onClick handlers
// - UnityEvent callbacks
// Even then, wrap the body in try/catch:
async void OnButtonClicked()
{
try
{
await SaveGameAsync();
}
catch (Exception e)
{
Debug.LogError(e);
}
}
```
GOTCHA: `async void` methods propagate exceptions to the `SynchronizationContext`, which in Unity logs them and potentially crashes. `async Awaitable` methods propagate exceptions to the awaiter, allowing proper try/catch. Unity's lifecycle methods (`Start`, `OnEnable`, etc.) can return `Awaitable` -- prefer this over `void` when using async.
---
## PATTERN: Concurrent Awaitable Race Conditions
WHEN: Multiple async operations modify shared state
WRONG (Claude default):
```csharp
// Two async methods writing to the same field
async Awaitable OnClickSearch(string query)
{
var results = await SearchAsync(query); // User types "cat"
_displayedResults = results; // Race: which query wins?
}
// User clicks twice quickly: "cat" then "dog"
// If "dog" returns first, "cat" results overwrite "dog" results
```
RIGHT:
```csharp
private CancellationTokenSource _searchCts;
async Awaitable OnClickSearch(string query)
{
// Cancel the previous search
_searchCts?.Cancel();
_searchCts?.Dispose();
_searchCts = new CancellationTokenSource();
var token = _searchCts.Token;
try
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- Ruta de instrucciones
- skills/unity-async-patterns/SKILL.md @ fefd1141f973
Versión declarada en el registro; consulta las versiones de la fuente.
Calidad
50/100
Requiere revisión
Confianza
62/100
Solo sandbox
Auditoría
70/100
Requiere revisión
- Permission surface may require sandboxing
- Financial research output is not financial advice; require human review before any live investment decision
- Low GitHub adoption signal
- Falta aprobación de revisión por IA
- Financial research output is not financial advice; require human review before any live investment decision.
- Quality score needs review
- Permission surface needs review: secrets or environment access, network or browser access
- GitHub adoption: 30 GitHub stars
- Stars/forks activity: 30 stars, 5 forks; issue activity unavailable in current metadata
- Permission surface: secrets or environment access, network or browser access
- Review status: AI review approval is missing
- Verified installs
- —
- Resultados
- —
Copiar no es instalar. Los recuentos requieren un informe de instalación correcta, no garantizan calidad general.
Acceso para agentes
La API Registry expone señales de decisión, confianza, auditoría, casos de uso e instalación sin raspar la interfaz.
Más detalles
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}Para el creador
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