When you use a color field and set the opacity to 50%, the resulting value given to HubL will have "50" instead of ".50" in the css value. So, if you set color to 000000 and opacity to 50%, you'd expect `color_field.css` to be `rgba(0, 0, 0, .50)`, but instead you get `rgba(0, 0, 0, 50)`. This effectively makes the `css` attribute useless and leaves devs needing to manually build the RGBA string.
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