java – 为什么这个类型参数保留在字节码中？

Replace all type parameters in generic types with their bounds or Object if the type parameters are unbounded. The produced bytecode,therefore,contains only ordinary classes,interfaces,and methods.

但是,对于以下类：

public class Foo<E extends CharSequence> {
    public E something;
}

javap -c Foo打印：

public class Foo<E extends java.lang.CharSequence> {
  public E something;
}

为什么type参数没有被绑定(CharSequence)替换,而是保存为E？