I knew there was a reason I didn't feel comfortable with it: 
#!/usr/bin/perl
BEGIN {
        $SIG{__WARN__} = sub { print "Warn in package ".caller().": ",
+  @_ };
    package X;
    $foo = "I'm in X, export me!";
    *Y::foo = *foo
}

package Y;
sub foo { "Oh dear.. I wasn't meant to be outside Y" }
warn $foo;

package X;
warn foo();

__END__
Warn in package Y: I'm in X, export me! at t.pl line 11.
Warn in package X: Oh dear.. I wasn't meant to be outside Y at t.pl li
+ne 14.

[download]

In other words.. all globals exported by copying the entire typeglob will have all the packages that import them sharing all globals with the respective names - and this is more than "just" a heavy caveat.

Makeshifts last the longest.

In reply to Re^4: A simple import() for those special moments by Aristotle
in thread A simple import() for those special moments by Aristotle

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