`hash': wrong number of arguments (given 1, expected 0) (ArgumentError)

You get the error when you have code like

```ruby
store_attributes :body do
  hash String
end
```

You can work around it by `store_attribute :body, :hash, String`.

1) Do we support defining of attributes like `hash` in a block, and if so, how?
2) If we don't, what kind of error can we raise instead? (Please use `store_attribute` syntax instead?)