Coalesce issue with transparent gifs

[bytezeroseven]

I am loading a transparent gif in which the circle keeps getting smaller and smaller and finally disappears. The problem is that when I set cumulative to true, the previous frames are merged and the effect is ruined. I am also loading some other gifs in which coalesce is required. I think there should be an automatic way for internally determining which gifs need coalesce and which do not. Does the gif format contains any information about using coalesce?

[bytezeroseven]

Okay I think I know what this library is missing. It doesn't use use disposal mode anywhere.
Disposal = 1 means dont clear the background. There should be a check for this mode while forming the frame if cumulative is true.

EDIT: Source https://docstore.mik.ua/orelly/web2/wdesign/ch23_05.htm#:~:text=Disposal%20method%20gives%20instructions%20on,areas%20of%20a%20later%20frame.