`_data` is stored on the `intl` call when the context (`this`) is a standard data object and not the application context. This data is then referenced and passed to the new context created in the intlBlock to avoid data from being lost inside the block call. When Handlebars 2.0 (the next milestone) is released `@root.` will be able to provide a way to reference that and `_data` should be able to be removed at that time.