:PROPERTIES:
:ID:       63e60abc-66a7-478d-a272-45c0e7c99c32
:END:
#+title: Avoid primitives

Wrapper types keep types distinct, e.g. a customer id can be represented as an
=int=, but /is not/ an =int=. This makes the domain model clearer, and they
cannot be mixed up accidentally (e.g. mis-ordered parameters) as the type
checker will prevent it.