@cknitt Sure being able to pass strings has upside in ease and downside in less safety, on the other hand, now people will not make mistakes with named colors (cornflowerblue, etc.) if they use the constants and not simply pass their names as string.

And we could always move back to an abstract type, simply by adding a type-conversion function and defining an appropriate interface for the module. So overall, I agree this is a good move.

Great work and thanks for the huge effort.