Slider widget's "step" appears to increment by 2x

Hello Bokeh Team. The Slider values appear to increment by a factor of 2. I tested the rendering with Bokeh 2.1.1. on Chrome and Firefox. Here’s a sample:

from bokeh.models import Slider
from bokeh import io
slider = Slider(start=0, end=9, value=0, step=1, title="foo")
io.show(slider)

Moving the slider will display 2x increments of ‘value’. The example in https://docs.bokeh.org/en/latest/docs/user_guide/interaction/widgets.html#slider appears to show the same issue. Thanks!

@ac-ML This should go in a bug report: https://github.com/bokeh/bokeh/issues

@Bryan Done. Thank you!

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