It appears to be AZ::Vector3,4
For example if I reflect a ColorF field all I get is a blank entry in the component.
ec->DataElement(AZ::Edit::UIHandlers::Color, &DataStruct::mColor3, "Color", "");
So with the replacement class the color picker works but now I lose all the utility functions for working with color. Examples: Lumanice and rgb<>srgb
ColorF is also far friendlier work with than AZ::Vector3,4.
colorf.r *= 2.f;
colorv3.SetX(colorv3.GetX() * 2.f);
Will there be an AZ::ColorF with the utility functions restored?