Defaulting to HTML5 causes issues when generating XML

[virtualfunction]

lib/haml-rails.rb:13 sets the format to html5 which prevents XML tags from closing. Before usign html-haml I was setting this as an config/initializers/ using:

Haml::Template.options.update \
  attr_wrapper: "'",
  format:       :xhtml, # HTML 5 wrecks RSS/ATOM
  preserve:     [ 'textarea', 'pre' ],
  autoclose:
    %w[ meta img link br hr input area param col base ] +
    %w[ media:content enclosure media:thumbnail atom:link itunes:category ]

Obviously I've wrapped it in a config.config_initialize but this might throw off other users if they are also using HAML for XML / RSS / ATOM files, or at least be clearly documented.

[indirect]

It's just a default. What's stopping you from setting options[:format] = :xhtml?