No problem. Actually list and element manipulation were the first things I tried, with limited success, when I encountered G’MIC scripting (which was not that long ago; am still a relatively new user 
). If I stare at your discussions long enough, I might learn something. Still struggling to follow the math and code but it is fun nevertheless. 
PS All of you can make it up by looking into An Error Reduction Technique in Richardson-Lucy Deconvolution Method. 