[Ulti]

Since Christmas 2015 was the "production" release of the language specification. Hence the 6.C version number, the C stands for Christmas. Rakudo around about now implements that feature set in a stable way. The last year has mostly been optimisation work in the runtime and VM. The whole thing is about as stable and production worth as Swift. That is to say features do still change, but not the ones already specced as 6.C