In recent versions, if slidesToShow is set to a value greater than the number of slides, all of the slick-cloned slides will be visible.

To replicate:
in the PlayGround (https://codesandbox.io/s/ppwkk5l6xx) update the settings:

var settings = {
      dots: true,
      slidesToShow: 5
    };

Version 0.21.0 does not behave this way. With version 0.21.0 if the slidesToShow is greater than the number of slides, it does not create the slick-cloned slides.