SIZE may be (or may be an integer optionally followed by) one of following: kB 1000, K 1024, MB 1000*1000, M 1024*1024 and so on for G, T, P, E, Z, Y.
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I like this suggestion very much. It solves our problem with fr_FR vs fr_CA, and make clearer for the user what it is all about, IMHO.
Good! I'll make that change after coreutils-5.0.