From:	David Nicol	Date:	Sun Aug 10 15:42:16 2008
Subject:	Re: Devel::Callsite is a better instance key than join $;,caller()[1,2]

On Fri, Aug 8, 2008 at 5:41 PM, Ben Morrow <ben@morrow.me.uk> wrote:
> [the interpreter address is] more unique than either pid or
> tid, and actually reflects 'Perl-level thread of control'.

I'm a little surprised; I thought that the interpreter address would
remain the same in both processes after a 'nix fork.