Now that pacman downloads partial files into `download-*/` subdirectories, due to the subdirectory name being randomized it is no longer able to resume an interrupted download. For example, Ctrl-C'ing at the download stage in the middle of a ~100 MB package file will leave a 50 MB .part in `download-aaaaa/` but the next invocation will start a fresh download into `download-bbbbb/`.
(The lack of resumption means that an existing .part file in those "old" subdirectories won't be cleaned up, either, leaving around junk that even `pacman -Scc` won't delete.)
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