Howdy.
I've released Types::PGPLOT to the CPAN.
It's a Type::Tiny type library for various inputs to PGPLOT routines.
By design it doesn't contain types for the PDL::Graphics::PGPLOT*
modules. That'll come in a separate module.
And here's my obligatory advertisement for an autoconf'd version of PGPLOT:
https://github.com/djerius/pgplot-autotool
Have Fun!
Diab