io.c: check ARGV element type
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52211 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
io.c: check ARGV element type
conversion if necessary. [ruby-core:71140] [Bug #11610]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52211 b2dd03c8-39d4-4d8f-98ff-823fe69b080e