gimp_drawable_get_pixel(): in Script-Fu for GIMP V2.99.18 is different regarding alpha

Previously gimp-drawable-get-pixel() returned the number of channels and an array of pixel values. In V2.99.18 it returns a GeglColor. The script that I am trying to update needs to know the alpha value for the pixel - easily done before but now I think it would need to use gegl_color_get_rgba() and I don't think that this is possible at the moment - or is there a way?