Realm Web: User custom data needs to be EJSON deserialized

[kraenhansen]

Goals & Expected Results

Users would expect custom data transmitted through the access token to be EJSON deserialized.

Actual Results

The data is not EJSON deserialized.

Steps to Reproduce

1. Create a collection of documents and enable custom user data.
2. Create a user and a matching document in the collection which contains an undefined value.
3. Authenticate the user and read the custom data.
4. See how the undefined value is returned as {{{ "$undefined": true }}} (see https://docs.mongodb.com/manual/reference/mongodb-extended-json-v1/#undefined-type)

Code Sample

Version of Realm and Tooling

• Realm JS SDK Version: Realm Web 0.9.0
• Node or React Native: Web
• Client OS & Version: N/A
• Which debugger for React Native: N/A