Using objects as _id in MongoDB

Using objects as _id fields in MongoDB can be dangerous. Something that has to be written with bold red text, but anyway, it's in the official documentation:

"Unlike JavaScript objects, the fields in a BSON document are ordered."

So, you can accidentally have documents like { _id: { name: "Launchpad", surname: "McQuack" } } and { _id: { surname: "McQuack", name: "Launchpad" } } in the same collection.

I have encountered this issue only once in production code, and fortunately, it was many years ago. However, I still see people using objects as identifiers or hash objects without sorting the properties, hence the post.