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mrb_int_mul_overflow is missing #3149
It would be mostly the same as https://github.com/mruby/mruby/blob/master/include/mruby/numeric.h#L40, so i guess its not in C99 too.
I'll add it. The difficult part here is the fallback for compilers without these built-ins. It needs to be portable and fast. Of course, only to some degree. With 16/32 b