Compile-Time objects

- class names (Type names) should start with '::'

- Array/Hash dereference (return Scalar)

- implement 'Code' class, with multi-dispatch
- replace 'Range' implementation with a lazy runtime object

- organize the internal "Namespaces"
  - maybe follow S02:Built-in Data Types:
    Mutable Immutable Undefined Value ...
  - or follow the pugs/ast model ?

  - find a place for specialized objects like Perl5 containers

- use some standard tool to make ast transformations