Tokamak link helper does not specify the type attribute

When I use the line bellow on tokamak file, the link helper does not specify the type attribute on the generated link tag.

Tokamak:

member.links << link(:rel => :delete, :href => article_url(@article.slug))

Result:

<link href="http://my_domain/articles/my-slug" rel="delete"/>

Hoped:

<link href="http://my_domain/articles/my-slug" rel="delete" type="..."/>