The execution never stops with forEach

[killmenot]

Hi @robtweed

During fixing memory db that I use for tests I found an interesting scenario that breaks forEachChild. The execution never stops for me.

It relates with the following functionality:
https://github.com/robtweed/ewd-document-store/blob/master/lib/proto/forEach.js#L78

The test case:

var documentStore = new DocumentStore(db); // db - GTM
var documentNode = new documentStore.DocumentNode('temp');

documentNode.delete();

var foo = {
  a: 'this is a',
  b: 'this is b',
  Barton: 'J',
  Briggs: 'A',
  Davies: 'D',
  Davis: 'T',
  Douglas: 'N',
  c: ['a', 's', 'd'],
  d: {
    a: 'a',
    b: 'b'
  }
};

documentNode.$('foo').setDocument(foo);

documentNode.$('foo').forEachChild({
  range: {
    to: '123'
  }
}, function (nodeName, node) {
  // do somethng
});

Even if the test case is not correct, I think we need to handle this behaviour. Another question, could you please provide me with example of correct test case for https://github.com/robtweed/ewd-document-store/blob/master/lib/proto/forEach.js#L78 I guess it should work with arrays only