Unparsing a type, often during unit testing via prn, requires the
type system implementation to be specified. This is too restrictive.
The unknown implementation should verbosely print types, and ignore
the current namespace.
Implementation extracted from this branch.
Waiting on: CTYP-256
Pull request: 43
Patch: ctyp-255.patch
Commit: 48c225
Release: 0.3.9