2013.08.28 in #110Perl 5 Internals - Part One
Rob Hoelz reports from a presentation given by Yves Orton and Steffen Mueller on the internals of Perl. Short and quite digestible covering the basics of memory allocation for scalar values.
2013.09.11 in #112Perl 5 Internals - Part Three
In which Rob Hoelz explains what is the difference between undef $x; and $x = undef; and how perl handles hashes internally.