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I recently received a bug report that lodepng couldn't load a png, reporting invalid ADLER32, initially I thought that file was corrupted, but it turns out this is a bug in lodepng that's already been fixed, I've verified that after updating lodepng, zopflipng was able to optimize that png file, no compression changes observed during my testing with the updated lodepng.
My guess is that lvandeve/lodepng@9652b36 fixed it