mruby/mruby — pull request #320 by monaka (2012-06-25 11:26:48+00:00)
Title: Use mrb_intern2 instead of mrb_intern as possible. 

This is related on #301. Similar to Matz's patch 19638ded7367520.
mrb_intern_str is sophisticated. But mrb_intern2 is more lightweight.
Anyway, places I changed by this fix should be fixed.