Hi, I posted this question in the forum, but have now thought about it a little more and it seems to me like its probably a bug so I'm posting here.

The essence is that when binding a prop to an element in an object using square brackets, it fails.

The examples I posted in there didn't work when using simple text/textarea fields. We noticed that it did work when using a more complicated table field. Maybe it has something to do with using a string vs. an object as the value.

I've updated the fiddle to illustrate this with a table fieldtype.
http://jsfiddle.net/9o5xjr0p/6/

Editing the cells in the table fieldtype works fine. Editing the text/textarea fields results in [Vue warn]: Error when evaluating setter "fieldData[field.name]".

Another thing to note is in this line:

<component :is="field.type + '-fieldtype'" :field-data.sync="fieldData[field.name]"></component>

If I hardcode the object's key, it works fine. eg. :field-data.sync="fieldData['foo']". But obviously this doesn't solve the issue :)

This all worked in 0.12. If you can point me in the right direction that would be fantastic.