MongoDB Index on different types

Question

We can have { data: \"hello\" }, { data: 123 } in the same collection and even create a index on it. I\'m curious how does mongodb manage the index behind the scene. We can\

Answer 1

There's no problem having two types in the same index. Each key within the index includes the type.

When you query, only objects matching the type you query on will be returned.

So if you query for {data: "hello"}, only strings will be returned, etc.