cp --reflink accepts a new "auto" parameter which falls back to
a standard copy if creating a copy-on-write clone is not possible.
+** POSIX conformance
+
+ tail -f now ignores "-" when stdin is a pipe or FIFO, per POSIX.
+ Now, :|tail -f terminates immediately. Before, it would block indefinitely.
+ [the old behavior dates back to the original implementation]
+
* Noteworthy changes in release 7.5 (2009-08-20) [stable]