I've been working through the design and implementation (using Moo) of a module (IPC::PrettyPipe) which implements some backend functionality via plugins. The nature of the module isn't that important; suffice it to say that there's a rendering backend and an execution backend.

I've previously implemented pluggable backends using Module::Pluggable and kin, but since I'm using Moo for this module I thought I'd investigate how its capabilities enabled (or constrained) pluggability.