Bug in solution of this task: https://javascript.info/array-methods#create-keyed-object-from-array

There's a bug in the solution posted in this task.
The task requires us to group objects by id and put the grouped objects in an array keyed by id.
The solution posted is:

function groupById(array) {
  return array.reduce((obj, value) => {
    obj[value.id] = value;
    return obj;
  }, {})
}

However, this does not work when there are items in array with same id.
To accomplish the task correctly, the solution should be:

function groupById(array) {
  return array.reduce((obj, value) => {
    obj[value.id] == undefined ? obj[value.id] = [value] : obj[value.id].push(value);
    return obj;
  }, {})
}

Abre la tarea de métodos de arrays en javascript.info/array-methods#create-keyed-object-from-array y compara el requisito de agrupación indicado con la solución publicada con reduce. Actualiza la solución documentada para que los IDs repetidos conserven todos los objetos agrupados y, después, verifica que el ejemplo y la explicación sigan coincidiendo con el resultado corregido.