'array.array' has no attribute 'clear'

array.array inheriting from MutableSequence has some unintended consequences, such as below

import array

x = array.array("B")
x.clear()

At runtime array.array does not have .clear(). Is it meant to have a .clear() implemented? Right now at least it doesn't and the stubs give an incorrect definition.

首先定位 array.array 的 typeshed 存根，并将其继承的 MutableSequence 方法与 issue 中展示的运行时行为进行比较。检查是否预期 array.array 提供 clear()；当存根准确反映运行时行为，并且 issue 中关于添加该方法的问题得到解决时，即表示完成。