Inspector shows Control.Opacity default as integer

In the control inspector, Opacity is a Double property with a valid range of 0.0 to 1.0, but the default value is displayed as 1. This can make the property look like it expects an integer value rather than a fractional opacity value.

Expected behaviour: show the default as 1.0 and give users a clear range hint such as 0.0 to 1.0.