In haml v6, neither of the following options are working.
template_option: Haml::Template.options[:hyphenate_data_attrs] = false
tag_option: %tag{:hyphenate_data_attrs => true}

In module, the above option is already not used and all data attributes are hyphenated.
Haml::AttributeBuilder#flatten_attributes

However, REFERENCE.md mentions hyphenate_data_attrs.

Should the option be enabled or should the description in REFERENCE.md be removed?