Fix Heading#to_name with respect to allow_extra?
Add support for allow_extra in parser.
Add Heading#[]
Add Attribute#optional? and test as well as required?
Refactor cucumber tests a bit.
Add use-case for missing information through optional attributes.
Rename finitio/high-level-types to finitio/dressing
Enhance spacing and comma rules to be more convenient.
Remove 'Given the system source is' step.
Ensure ProxyType#resolve raises a Finitio::Error
Add AliasType for type aliases (to come)
Add an explicit main_type rule/module.
Add proper support for type aliases.