Add to_i feature to TrueClass and FalseClass object

object.c

/*
 * call-seq:
 *   false.to_i   ->  0
 *
 * The integer representation of <code>false</code> is 0.
 */

static VALUE
false_to_i(VALUE obj)
{
    return INT2FIX(0);
}

/*
 * call-seq:
 *   true.to_i   ->  1
 *
 * The integer representation of <code>true</code> is 1.
 */

static VALUE
true_to_i(VALUE obj)
{
    return INT2FIX(1);
}

    /*
     * Document-class: Data
     *
     * This is a recommended base class for C extensions using Data_Make_Struct
     * or Data_Wrap_Struct, see doc/extension.rdoc for details.
     */
    rb_define_method(rb_cTrueClass, "to_i", true_to_i, 0);
    rb_define_method(rb_cFalseClass, "to_i", false_to_i, 0);