OpenSSL::X509::ExtensionFactory#create_ext の結果の違い

gistfile1.rb

## ruby 2.0.0dev
irb(main):001:0> require 'openssl'
=> true
irb(main):002:0> ef = OpenSSL::X509::ExtensionFactory.new
=> #<OpenSSL::X509::ExtensionFactory:0x007fd72213f6e0 @config=nil>
irb(main):003:0> ef.create_ext('basicConstraints', 'CA:TRUE, pathlen:1', true)
=> #<OpenSSL::X509::Extension:0x007fd7221245e8>


## ruby 1.9.3p194
irb(main):001:0> require 'openssl'
=> true
irb(main):002:0> ef = OpenSSL::X509::ExtensionFactory.new
=> #<OpenSSL::X509::ExtensionFactory:0x007ff4ab085de8>
irb(main):003:0> ef.create_ext('basicConstraints', 'CA:TRUE, pathlen:1', true)
=> basicConstraints = critical, CA:TRUE, pathlen:1