Review the decision to refer to com-ports by name

[tarefa]

This was designed as a convenience for use at the REPL.

It isn't idiomatic Clojure but we are already dealing with I/O here: global resources (global to the OS, not just Clojure instance or even the JVM) which are not only stateful, they mutate outside our control.

Is there a better abstraction I can use?

Should I ensure the implementation details don't leak out (all public functions to return explicit return values or nil if they are purely side-effectual)? In that case, do I need functions to retrieve the baud rate, parity setting, etc?