realm-js: Default value doesn't apply for newRealm migrations, all fields are required.

Goals

To be able create new objects without specifying fields with default values during migration.

Expected Results

New objects created.

Actual Results

Error: http://localhost:8083/call_method net::ERR_EMPTY_RESPONSE

Steps to Reproduce

Create model with a default value and try to create new object from it during migration without using the default fields.

Code Sample

const CarSchema = {
  name: 'Car',
  properties: {
    make:  'string',
    model: 'string',
    miles: {type: 'int', default: 0},
  }
};

// will break
{
  schema: [CarSchema],
  schemaVersion: 1,
  migration: (oldRealm, newRealm) => {
    newRealm.create("CarSchema", {
      make: "lambo",
      model: "murcy"
    });
  }
}

// will succeed
{
  schema: [CarSchema],
  schemaVersion: 1,
  migration: (oldRealm, newRealm) => {
    newRealm.create("CarSchema", {
      make: "lambo",
      model: "murcy",
      miles: 0
    });
  }
}

Version of Realm and Tooling

• Realm JS SDK Version: 2.1.1
• Node or React Native: react-native
• Client OS & Version: chrome 63
• Which debugger for React Native: chrome