Prefer Ruby 2.0; require 1.9.3+

Author: jeremy

guides/source/4_0_release_notes.md

@@ -3,7 +3,7 @@ Ruby on Rails 4.0 Release Notes
 
 Highlights in Rails 4.0:
 
-* Ruby 1.9.3 only
+* Ruby 2.0 preferred; 1.9.3+ required
 * Strong Parameters
 * Turbolinks
 * Russian Doll Caching

guides/source/getting_started.md

@@ -21,7 +21,7 @@ application from scratch. It does not assume that you have any prior experience
 with Rails. However, to get the most out of it, you need to have some
 prerequisites installed:
 
-* The [Ruby](http://www.ruby-lang.org/en/downloads) language version 1.9.3 or higher
+* The [Ruby](http://www.ruby-lang.org/en/downloads) language version 1.9.3 or newer
 * The [RubyGems](http://rubygems.org/) packaging system
     * To learn more about RubyGems, please read the [RubyGems User Guide](http://docs.rubygems.org/read/book/1)
 * A working installation of the [SQLite3 Database](http://www.sqlite.org)
@@ -84,7 +84,7 @@ current version of Ruby installed:
 
 ```bash
 $ ruby -v
-ruby 1.9.3p327
+ruby 1.9.3p385
 ```
 
 To install Rails, use the `gem install` command provided by RubyGems:

guides/source/upgrading_ruby_on_rails.md

@@ -16,11 +16,11 @@ The best way to be sure that your application still works after upgrading is to
 
 Rails generally stays close to the latest released Ruby version when it's released:
 
-* Rails 3 and above requires Ruby 1.8.7 or higher. Support for all of the previous Ruby versions has been dropped officially and you should upgrade as early as possible.
-* Rails 3.2.x will be the last branch to support Ruby 1.8.7.
-* Rails 4 will support only Ruby 1.9.3.
+* Rails 3 and above require Ruby 1.8.7 or higher. Support for all of the previous Ruby versions has been dropped officially. You should upgrade as early as possible.
+* Rails 3.2.x is the last branch to support Ruby 1.8.7.
+* Rails 4 prefers Ruby 2.0 and requires 1.9.3 or newer.
 
-TIP: Ruby 1.8.7 p248 and p249 have marshaling bugs that crash Rails. Ruby Enterprise Edition has these fixed since the release of 1.8.7-2010.02. On the 1.9 front, Ruby 1.9.1 is not usable because it outright segfaults, so if you want to use 1.9.x, jump on to 1.9.2 or 1.9.3 for smooth sailing.
+TIP: Ruby 1.8.7 p248 and p249 have marshaling bugs that crash Rails. Ruby Enterprise Edition has these fixed since the release of 1.8.7-2010.02. On the 1.9 front, Ruby 1.9.1 is not usable because it outright segfaults, so if you want to use 1.9.x, jump straight to 1.9.3 for smooth sailing.
 
 Upgrading from Rails 3.2 to Rails 4.0
 -------------------------------------

railties/lib/rails/ruby_version_check.rb

@@ -2,12 +2,12 @@
   desc = defined?(RUBY_DESCRIPTION) ? RUBY_DESCRIPTION : "ruby #{RUBY_VERSION} (#{RUBY_RELEASE_DATE})"
   abort <<-end_message
 
-    Rails 4 requires Ruby 1.9.3+.
+    Rails 4 prefers to run on Ruby 2.0.
 
     You're running
       #{desc}
 
-    Please upgrade to continue.
+    Please upgrade to Ruby 1.9.3 or newer to continue.
 
   end_message
 end