[TRI-3840] Logging infinitely recursive javascript objects crashes, inside flattenAttributes.

[matt-aitken]

Problem

If you try and log an object that has a circular reference, our flattenAttributes code will exceed the stack depth and fail.

Example: a user that has blog posts that have an author (that points back at the user).

This is a major issue with MongoDB which returns JS objects like this.

Solution

Detect circular objects and don't add them to the log output, put a placeholder string instead.

_{From SyncLinear.com | TRI-3840}

[yadavshubham01]

hey @matt-aitken solve this issue please checkout this PR #1433