arxiv pdf: download to temp file then move, so a failed download no longer poisons re-entry with a corrupt partial file. e-print tar: --max-size is not a GNU tar option and silently did nothing; extract first then audit with du, failing if >50M.
arxiv pdf: download to temp file then move, so a failed download no longer poisons re-entry with a corrupt partial file. e-print tar: --max-size is not a GNU tar option and silently did nothing; extract first then audit with du, failing if >50M.