[skywhopper]

??? This is nothing like the Python transition. In Python there were two incompatible language versions side by side for years that made it really hard on library maintainers. Ruby is giving a 7-8 year transition period before this even hits, with years of warnings built-in to the plan. What more would you have them do?

[lloeki]

Not to mention that in addition to the opt-in warning that came with 3.4, if you've been using any reasonable linter such as Rubocop for the past 10ish years then you're already being yelled at for lack of `# frozen_string_literal: true` magic comment.