> semantically inaccessible, not syntactically inaccessible.

You can give the semantics of everything that happens in a safe d-t language in terms of church encoded tag-value pairs and yet the programmer can't break the abstraction because abstraction-breaking operations are syntactically unavailable.

It should count as testament to the success of dynamic typing that the abstractions are so safely enforced that you can squint and suddenly the whole language is semantically founded on them.