sort(1) -uf output inconsistent with

[bruce at ISM780.UUCP]

>       CONCLUSION:
>         The output should always be in lower case.  Changing the manual
>       page  to  indicate  the  problem  will  only serve to confuse the
>       situation.

I disagree, you've ignored the fact that there may be other stuff on the
line that isn't part of the key. For example if my input were:

	sort -fu +0 -1 <<!
	JUNK    fizz
	Junk    frap
	junk    fart
	!

Your fix would produce:

	junk    fizz

This doesn't correspond to an actual input line.