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As a special case the 3 arg form with a read/write mode and the
third argument being "undef":
...
"+<" works for symmetry, but you really should consider writing
something to the temporary file first.  You will need to seek()
to do the reading.

If FILEHANDLE is an undefined scalar variable (or array or hash
element) the variable is assigned a reference to a new anony-
mous filehandle,