Rails 4 support ruby > 1.9.3 whereas rails 3 supports 1.8.x. I believe this coul... | Hacker News

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pothibo on Sept 16, 2014 | parent | context | favorite | on: Upgrading GitHub to Rails 3 with Zero Downtime

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.

thedaniel on Sept 16, 2014 | [–]

We moved to Ruby 1.9+ quite a while ago with our patched-up Rails 2.3.

alttab on Sept 16, 2014 | [–]

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.

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