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Yukihiro "Matz" Matsumoto
caee1f68a2
They used to return `mrb_value` but now return `mrb_sym` for consistency with other `intern` functions. If symbols are not defined, `check` functions return `0`, instead of `nil` in the past. It causes API incompatibility but I believe few people use those functions out of the core, and those changes are very easy to handle, hopefully.