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Rails 4 support ruby > 1.9.3 whereas rails 3 supports 1.8.x. I believe this could be the main reason why they didn't move to Rails 4. Ruby 1.8.x -> Ruby 1.9.x

by pothibo 12y ago

Rails 4 support ruby > 1.9.3 whereas rails 3 supports 1.8.x. I believe this could be the main reason why they didn't move to Rails 4. Ruby 1.8.x -> Ruby 1.9.x requires quite some work by itself.

alttab 12y ago
Mainly due to string encoding. For something like Github, mistakes there could be disastrous. With all of the special characters and user input there are bound to be wild edge cases.
thedaniel 12y ago
We moved to Ruby 1.9+ quite a while ago with our patched-up Rails 2.3.