[arnvald]

I don’t think the language itself is Japanese centric. In the past the discussions among the language development often happened in Japanese, but I don’t think it’s the case anymore (though I don’t follow it closely) since there are a lot of international core language contributors now

[lloeki]

Historically - like, way back - a lot of the Ruby core chatter happened on a japanese mailing list, and that's where a lot of decisions ended up taking place, or it wasn't uncommon to have sudden hard subjects bombdrop on the english side while a lot of discussion already happened on the mailing list already so it was hard to catch up.

These days it seems like bugs.ruby-lang.org has most of the chatter.