Description:

Struct::Dumb creates record-like structure types, similar to the
struct keyword in C, C++ or C#, or Record in Pascal. An invocation of
this module will create a construction function which returns new
object references with the given field values. These references all
respond to lvalue methods that access or modify the values stored.

It's specifically and intentionally not meant to be an object class.
You cannot subclass it. You cannot provide additional methods. You
cannot apply roles or mixins or metaclasses or traits or antlers or
whatever else is in fashion this week.