message: Rotation cache optimization
diff: @@ -186,10 +186,13 @@ export default class Transform
  }
  set rotation(value) // eslint-disable-line require-jsdoc
  + {
  + if (this._rotation !== value)
  {
  this._rotation = value;
  this.updateSkew();
  }
  }
  +}
  Transform.IDENTITY = new Transform();
  