message: SharedMatrix: Fixed not serializing handles in toString
diff: @@ -723,7 +723,7 @@ export class SharedMatrix<T = any>
  s += ", ";
  }
  - s += `${JSON.stringify(this.getCell(r, c))}`;
  + s += `${this.serializer.stringify(this.getCell(r, c), this.handle)}`;
  }
  s += "]\n";
  }
  