Returning Dir objects from C extensions
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In 1.8 it was possible to return Dir objects from C extensions by mimicking the code in dir.c and using Data_Wrap_Struct(rb_cDir, dir_mark, dir_free, dirp). This doesn't work in 1.9+, so it would be nice to have the Dir methods exposed to C extensions. For example, something like "VALUE rb_dir_new(DIR *)".