What pieces are you looking to be stable (and what's your definition of stable)? Asking because some pieces, like the Collector, aren't technically a stable 1.

What pieces are you looking to be stable (and what's your definition of stable)? Asking because some pieces, like the Collector, aren't technically a stable 1.0 yet, but the bar for stability is extremely high, and in practice it's far more stable than most software out there. But there are other pieces, such as a language's support for a specific concept, that are truly experimental or even still in-development.