类：SlowBuffer
¥Class: SlowBuffer
稳定性: 0 - 已弃用：改用
Buffer.allocUnsafeSlow()。¥Stability: 0 - Deprecated: Use Buffer.allocUnsafeSlow() instead.
参见 Buffer.allocUnsafeSlow()。从构造函数总是返回 Buffer 实例而不是 SlowBuffer 实例的意义上来说，这从来都不是一个类。
¥See Buffer.allocUnsafeSlow(). This was never a class in the sense that
the constructor always returned a Buffer instance, rather than a SlowBuffer
instance.