du -k gives incorrect result

[Dr-Irv]

• Your Windows build number: 10.0.15063]

• What you're doing and what's happening: (Copy&paste specific commands and their output, or include screen shots)

(echo "s='a'*(1024*12)" ; echo "print s") | python > foo.out
ls -l foo.out ; du -k foo.out ; du -b foo.out

yields

-rwxrwxrwx 1 root root 12289 Dec 11 16:03 foo.out
8193    foo.out
12289   foo.out

• What's wrong / what should be happening instead:
  The output should be (determined by using cygwin):

-rwxrwx---+ 1 (Omitted) 12289 Dec 11 16:03 foo.out
16      foo.out
12289   foo.out

So with the "-k" option, it is not computing the correct value of the number of kilobytes.

[therealkenc]

Well it was a good run. #2517, #2500, #2440, #2434, #2400, #2347, #2211, #1894. Fixed in 16237.