Looking at the git repo I learned this:
Arrays is an array of arrays, you can pass null arrays for those you don't use, the first array is for vertex information (ARRAY_VERTEX = 0), next are normals, tanget, etc.
I didn't look at what morphs do (animation maybe?) but it looks like you can left it with the default value, same for alphasort (if your mesh has transparency this helps to fix rendering artifacts).
I cannot test it at this time, but I hope this may guide you.