+Although FileCache can be used with piped opens ('-|' or '|-') doing so is
+strongly discouraged. If FileCache finds it necessary to close and then reopen
+a pipe, the command at the far end of the pipe will be reexecuted - the results
+of performing IO on FileCache'd pipes is unlikely to be what you expect. The
+ability to use FileCache on pipes may be removed in a future release.
+
+FileCache does not store the current file offset if it finds it necessary to
+close a file. When the file is reopened, the offset will be as specified by the
+original C<open> file mode. This could be construed to be a bug.
+