Conform with other IO mode usage.
Conform with other IO mode usage.

kachick/mspec,opal/mspec,ryoqun/mspec,iainbeeston/mspec,nobu/mspec,MagLev/mspec,shirosaki/mspec,eregon/mspec,ryoqun/mspec,rdp/mspec,timfel/mspec,Gibheer/mspec,Zoxc/mspec,elia/mspec,opal/mspec,MagLev/mspec,ruby/mspec,iainbeeston/mspec,mkb/mspec,kachick/mspec,ruby/mspec,voxik/mspec,rubinius/mspec,shugo/mspec,alex/mspec