perl-5.003_20

The only big change in this release is the recension of support for
named closures:  Now, no subroutine declared "sub foo {}" can be a
closure.  (This is a return to the behavior of 5.003.)  In addition,
there are new warnings triggered by any apparent attempt to use named
functions as closures.

And, as usual, there are the usual little fixes, documentation
updates, and expanded tests.  This is good stuff.  "I love you, man!"