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=item path

Required. A plain string or arrayref of strings of directories to watch. All
subdirectories beneath these directories are watched.

=item latency

Optional.  The number of seconds the FSEvents service should wait after hearing
about an event from the kernel before passing it along.  Specifying a larger value
may result in fewer callbacks and greater efficiency on a busy filesystem.  Fractional
seconds are allowed.

Default: 2.0

=item since

Optional.  A previously obtained event ID may be passed as the since argument.  A
notification will be sent for every event that has happened since that ID.  This can
be useful for seeing what has changed while your program was not running.