Error with optional and compose models. Cannot read property 'find' of undefined

[jchamb]

I have:

• I think something is not working as it should.
  • I've checked documentation and searched for existing issues
  • I've made sure your project is based on the latest MST version

Updating my code to v3.0 ran into an issue after removing types.optional around my array types. I get the above error anytime I use a composed model. Reproduction of the issue below

https://codesandbox.io/s/71kz23n6pj

[mweststrate]

Confirmed, that looks like a bug indeed

[jchamb]

error is also thrown with optional around enumeration.
types.optional(types.enumeration("state", ["init", "pending", "done", "error"]), "init")

[mweststrate]

Confirmed, fixed by #937. Fix will be released later today

[mweststrate]

Released as 3.0.2