Excellent post by tye
I almost always use an ampersand because I think of it
as another "type" delmiter - scalars start with a
dollar sign, arrays with an "at", hashes with a
percent, typeglob with a star, and subroutine with
an ampersand. Why file handles did not get their
own little symbol is still a mystery. :)
I also believe that it is required when you
undef a subroutine, FWIW
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