slider's step with decimal value

Hey, i have a problem w slider step, i try to set step as 0.1 but it doesn’t work. however decimal steps greater than 1 (e.g, 1.1, 2.5) work in proper way.
is it a bug or it’s intended behaviour?

Similar code works for me correctly, check the next snippet http://webix.com/snippet/1d6619bb