In reply to What is the OpenType Layout tag registry expected audience?:
What is the OpenType Layout tag registry expected audience?
People working in type tech and techy type designers.
For hlig, it says : "This feature overrides the results of all other features." What does this means and who is responsible for enforcing it?
It’s also a suggestion. It means that it makes sense to place the hlig feature towards the end of the feature list, like the kern feature, the order of execution of which will be defined in the font file.
You are responsible for ordering features. Nobody is responsible for enforcing anything.