Arrays whose elements are class-backed interface values are native arrays
of the element capsules, so iteration, indexing and most array methods no
longer go through the checked-dynamic array, and method calls receive a
receiver they can dispatch. Methods without a native form for these
elements run on the array's live dynamic view.
A read of an interface property signature has the property's static type
and reads the field of an implementing class directly. Accessors, object
literals and JavaScript classes keep the checked property read.
