I would agree if this produced output like keysort but with better number handling, but because the null characters are treated equivalently to any other non-word characters, and natsort splits the words on these, the output differs more than just on numbers. Note that 'abc-def' now sorts before '/abc/def' in the output: 
Ordered with keysort:
    /abc
    /abc/1/2/a/b/c
    /abc/2
    /abc/22
    /abc/3
    /abc/def/1/2/a/b/c
    /abc!def/1/2/a/b/c
    /abc-def/1/2/a/b
    /abcdef/1/2/a/b/c
    /usr/a
Ordered with natkeysort:
    /abc
    /abc/1/2/a/b/c
    /abc/2
    /abc/3
    /abc/22
    /abc-def/1/2/a/b
    /abc/def/1/2/a/b/c
    /abc!def/1/2/a/b/c
    /abcdef/1/2/a/b/c
    /usr/a

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In reply to Re^3: Sorting path names with Sort::Key by Anonymous Monk
in thread Sorting path names with Sort::Key by Anonymous Monk

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