Hi, just want to add my 2 sats to this. As and app developer I would prefer to work with Key/Value syntax because
- it is readily supported in almost every language and framework having parsing/binding for it, and
- it gives me more explicit info what kind of payment that is supposed to be instead of trying to guess it from the value only.
These are just minor details, but I think makes the k/v preferable for the target audience which are app developers 