Timestamps, id and version key

[laygir]

Hello,

Mongo newbie here 👋 May I ask if timestamps: true is intentional? Right after that with toJSON they are being removed.
Is there an implicit reason?

Actually there are options for version key, timestamps and id, so they could all be controlled by passing the options for a schema, what is the point of toJSON and all that transformation?

const userSchema = mongoose.Schema(
  {
    /* schema definition here */
  },
  { timestamps: true }
);

userSchema.plugin(toJSON);

The toJSON plugin applies the following changes in the toJSON transform call:

removes __v, createdAt, updatedAt, and any schema path that has private: true
replaces _id with id