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it will not buy you anything, but if yiu are interested:
1. fa stores directory names in archive. it's useful because 1) it stores datatime stamps of dirs so they can be restored on extraction too, and 2) if some directory is empty, it will allow recreate this directory on extraction. due to last reason, the option that fiorces this named "store empty directories"
2. since there is no "file contents" in directories, they are considered as files of length 0. it's meaningless to compress such files, so they are joined together and stored in the block with "storing" method. it's just a technical detail that allows to simplify the program
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