#009417: Bad variable naming

When using image alias with name ?1-kolonne? eZ template language is unpredictable. For instance on a object having an image (as object relation) and having image alias named ?1-kolonne? do the following:

<code>{$contentobject.data_map.image.content.data_map.image.content.1-kolonne|attribute(show,1)}</code>

The above will return nothing, while:
<code>{$contentobject.data_map.image.content.data_map.image.content."1-kolonne"|attribute(show,1)}</code>
Will return an array with info as expexted (note the « around 1-kolonne).

Operating System: Windows XP
PHP Version: 4.4
Database and version: MySql 4.X

See issue description