Updated: Comment #N
Problem/Motivation
Right now, \Drupal\Core\TypedData\ListInterface only allows access to it's items through \ArrayAccess. That's nice where you can use and I think we should continue to support it, but it would be useful to have better methods instead of offsetGet(0), that's just weird.
Proposed resolution
Add first() and get($index). There's also a method for an toArray() (right now called getValue()), let's leave that out here.
Remaining tasks
Implement it.
User interface changes
None
API changes
Only additions.
