File-to-file transfer fails

[lynaghk]

This is with

                 [byte-transforms "0.1.1"
                  :exclusions [byte-streams]]
                 [byte-streams "0.1.7"]

Trying to copy from one file to another fails:

(bs/transfer (File. "test/fixture/kittensB/kitten1.jpg")
             (File/createTempFile "difftron" "image-diff"))

yields

sun.nio.ch.FileChannelImpl cannot be cast to java.lang.Number
  [Thrown class java.lang.ClassCastException]

Restarts:
 0: [QUIT] Quit to the SLIME top level

Backtrace:
  0:        byte_streams.clj:699 byte-streams/eval4829[fn]
  1:        byte_streams.clj:425 byte-streams/this[fn]
  2:        byte_streams.clj:465 byte-streams/transfer
  3:        byte_streams.clj:460 byte-streams/transfer
  4: form-init6519885573008950383.clj:1 com.keminglabs.difftron.image-diff/eval11751

However, converting first to a byte-buffer works fine:

(bs/transfer (bs/to-byte-buffer (File. "test/fixture/kittensB/kitten1.jpg"))
             (File. "foo.jpg"))
=> nil