I've recently started migrating my backend projects to ESM and encountered an issue where `instance instanceof Class` on bson objects don't work, if the `instance` comes from `bson` module and the `Class` from `mongodb` (or vice versa).

The reason I end up with instances from one lib and Class from the other is that I use `bson` on it's own is some shared modules which contain Schema used for validation of unknown values, and then `mongodb`  in services which need to connect to mongo. The shared modules are also used on the frontend so I obviously don't want to pull in entire `mongodb` into the bundle. 

I believe the root cause is that `mongodb` package is built as `cjs`, so when it re-exports `bson` Classes they are pulled from the `cjs` version of bson package. At the same time, since `bson` package is dual (containing both `mjs` and `cjs`) when it's imported from an ESM module, the msj version is returned. 

I guess the solution would be to publish mongodb as dual as well, so that in ESM projects only the mjs versions of both packages would be used.