should `options` ignore properties that are `null` or `undefined`?

[leroix]

i.e.

{
...
, options: {
    replicaSet: env.REPLICASET
  }
}

when REPLICASET hasn't been set

[lmammino]

That's an interesting idea @leroix.

Anyway, just to figure out better your use case, I generally expect REPLICASET to be an object. What do you want to pass from a ENV variable?

[leroix]

Yup, in my case I'm configuring mongo from the environment, and REPLICASET would be the name of the replica set (i.e. a string). In some cases, like a local environment, REPLICASET won't be set since we'll just have a solo mongodb server.

[markstos]

I think undefined value should be ignored.