I had to look up GLR: the "Great List Refactor". http://pmthium.com/2014/10/apw2014/ http://pmthium.com/2014/10/apw2014/ "What exactly is the “Great List Refa

I had to look up GLR: the "Great List Refactor". http://pmthium.com/2014/10/apw2014/ http://pmthium.com/2014/10/apw2014/ "What exactly is the “Great List Refactor” (GLR)? For several years Rakudo developers and users have identified a number of problems with the existing implementation of list types — most notably performance. But we’ve also observed the need for user-facing changes in the design, especially in generating and flattening lists. So the term GLR now encompasses all of the list-related changes that seem to want to be made."