SpEL中SimpleEvaluationContext.forReadOnlyDataBinding()的混乱行为

我正在阅读Spring5.1.3参考文档 SpEL Type Conversion 获取以下示例代码:

class Simple {
    public List<Boolean> booleanList = new ArrayList<Boolean>();
}

Simple simple = new Simple();
simple.booleanList.add(true);

EvaluationContext context = SimpleEvaluationContext.forReadOnlyDataBinding().build();

// false is passed in here as a string. SpEL and the conversion service
// correctly recognize that it needs to be a Boolean and convert it
parser.parseExpression("booleanList[0]").setValue(context, simple, "false");

// b is false
Boolean b = simple.booleanList.get(0);

它与前面提到的文档一样工作,并更改属性的值,但是根据Javadocs forReadOnlyDataBinding()

创建一个{@code SimpleEvaluationContext},以便通过{@link DataBindingPropertyAccessor}对公共属性进行只读访问。

SpEL表达式不应该是只读的,并且不更改属性值吗?