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Performs multiplication:
4 * 2              # => 8
4 * -2             # => -8
-4 * 2             # => -8
4 * 2.0            # => 8.0
4 * Rational(1, 3) # => (4/3)
4 * Complex(2, 0)  # => (8+0i)
 
               VALUE
rb_int_mul(VALUE x, VALUE y)
{
    if (FIXNUM_P(x)) {
        return fix_mul(x, y);
    }
    else if (RB_BIGNUM_TYPE_P(x)) {
        return rb_big_mul(x, y);
    }
    return rb_num_coerce_bin(x, y, '*');
}
            

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