lib: fix handling of file size limits
lib: fix handling of file size limits

ACT1GMR/multer,xixilive/multer,zhaoshiling1017/multer,wowzzangga/multer,jg3526/multer,kylev/multer,hwqin/multer,expressjs/multer,mixxen/multer,jacobtomlinson/multer,kangkot/multer,ramanujadasu/multer