[Peaker]

Loading partially incorrect would mean that the invariants are not, in fact, invariants.

Encoding the metadata in the text would lose the benefit of using text. At that point you may as well store the code as XML or indeed as we do, in a key value store.

We could layer our data on top of text but this would lose the algorithmic benefits of a good data structure, and wouldn't actually be editable reasonably with a simple text editor.