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static VALUE
nurat_equal_p(VALUE self, VALUE other)
{
    switch (TYPE(other)) {
      case T_FIXNUM:
      case T_BIGNUM:
        {
            get_dat1(self);

            if (f_zero_p(dat->num) && f_zero_p(other))
                return Qtrue;

            if (!FIXNUM_P(dat->den))
                return Qfalse;
            if (FIX2LONG(dat->den) != 1)
                return Qfalse;
            if (f_equal_p(dat->num, other))
                return Qtrue;
            return Qfalse;
        }
      case T_FLOAT:
        return f_equal_p(f_to_f(self), other);
      case T_RATIONAL:
        {
            get_dat2(self, other);

            if (f_zero_p(adat->num) && f_zero_p(bdat->num))
                return Qtrue;

            return f_boolcast(f_equal_p(adat->num, bdat->num) &&
                              f_equal_p(adat->den, bdat->den));
        }
      default:
        return f_equal_p(other, self);
    }
}
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