._add() meta-method not called for strings


I’ve come across a strange edge-case with this certain meta-method. At first I thought it was a bug with Imp’s implementation of Squirrel, but I got the same results running in Squirrel on my laptop. I’ve made an issue on the Squirrel Github repository describing what I was expecting and what actually happens. Thought some Imp people might want to know about it and participate in discussion with the maintainer if/when they respond.