cycler interrogation

As it stands, one can not easily perform validation on the cycler components, such as validating the list of colors, and then the list of line styles. You have to iterate the cycler, and validate the individual values as scalars instead of as a whole list.

Start by reading the issue and inspecting the cycler component API and its current iteration behavior. Determine how whole-list validation for colors and line styles should be exposed, and consider the work complete when callers can validate those component lists without validating individual scalar values.

Written by the indexing model from the issue text.