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Thanks for trying that out. Deparse is a good idea, I get the same results as you except for case two, where my Deparse says
say sort('get_keys' ());
vs your
say((sort get_keys ()));

Interestingly, feeding my Deparse output back to perl leads to a syntax error. Your version seems to indicate what perl is doing here. Trying to sort the empty list () with the compare-function get_keys, hence the empty return.

-- Hofmator

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In reply to Re^2: Sorting result of function call by Hofmator
in thread Sorting result of function call by Hofmator

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    [davido]: yeah, umount -f isn't powerful enough.
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