Use cgo.Handle for state

[jordemort]

Instead of keeping interpreter state in a homemade global map, use a library that is specifically designed for passing Go pointers back and forth to C.

[colindean]

Neat. Does this afford any performance benefit? Or is it one of those things that's just less stuff for this code to handle once delegated to cgo?

[jordemort]

I'm not sure if it would have any performance benefit, but after finding that library I realized I had essentially recreated it by hand because I didn't know about it. It feels a lot cleaner to use it to me, because there are no longer any global variables in on the Go side; at least, there aren't any more in this code that you can see :)