<=>(p1) public

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static VALUE
nurat_cmp(VALUE self, VALUE other)
    switch (TYPE(other)) {
      case T_FIXNUM:
      case T_BIGNUM:

            if (FIXNUM_P(dat->den) && FIX2LONG(dat->den) == 1)
                return f_cmp(dat->num, other);
            return f_cmp(self, f_rational_new_bang1(CLASS_OF(self), other));
      case T_FLOAT:
        return f_cmp(f_to_f(self), other);
      case T_RATIONAL:
            VALUE num1, num2;

            get_dat2(self, other);

            if (FIXNUM_P(adat->num) && FIXNUM_P(adat->den) &&
                FIXNUM_P(bdat->num) && FIXNUM_P(bdat->den)) {
                num1 = f_imul(FIX2LONG(adat->num), FIX2LONG(bdat->den));
                num2 = f_imul(FIX2LONG(bdat->num), FIX2LONG(adat->den));
            else {
                num1 = f_mul(adat->num, bdat->den);
                num2 = f_mul(bdat->num, adat->den);
            return f_cmp(f_sub(num1, num2), ZERO);
        return rb_num_coerce_bin(self, other, id_cmp);
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