Fix superclass mismatch for class StringIO

[kou]

% ruby -I lib -r ffi_yajl/ffi -r stringio -e ''
/usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require': superclass mismatch for class StringIO (TypeError)
        from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'

[lamont-granquist]

don't you need a class StringIO < Data later along with the corresponding patch to the c extension?

[kou]

don't you need a class StringIO < Data later along with the corresponding patch to the c extension?

It's not needed. We don't need to specify parent class when we open defined class:

require "stringio"

class StringIO
end

p StringIO.ancestors # => [StringIO, IO::generic_writable, IO::generic_readable, Enumerable, Data, Object, Kernel, BasicObject]

[kou]

FYI: It's a good manner that we use require "date" instead of class DateTime < Date.

[lamont-granquist]

ah, cool, you want to fix that one as well and rebase?

[kou]

ah, cool, you want to fix that one as well and rebase?

Done.

[lamont-granquist]

Cool, I think it may need to be moved up a level and also fixed in the c-extension, but can shave that yak another day.