This means that now, if you set a value in a context variable before `yield`, the value would still be available after `yield` (as you would intuitively expect). And it also means that you can reset the context variable with a token afterwards.

For example, this works correctly now:

```Python
from contextvars import ContextVar
from typing import Any, Dict, Optional

- Kubeadm: when adding new control plane nodes with "kubeadm join", ensure that the etcd member addition is performed only if a given member URL does not already exist in the list of members. Similarly, on "kubeadm reset" only remove an etcd member if its ID exists. ([#127619](https://github.com/kubernetes/kubernetes/pull/127619), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

### Other (Cleanup or Flake)

pkg go/doc, type Package struct, Examples []*Example
pkg go/doc, type Type struct, Examples []*Example
pkg hash/maphash, func MakeSeed() Seed
pkg hash/maphash, method (*Hash) BlockSize() int
pkg hash/maphash, method (*Hash) Reset()
pkg hash/maphash, method (*Hash) Seed() Seed
pkg hash/maphash, method (*Hash) SetSeed(Seed)
pkg hash/maphash, method (*Hash) Size() int
pkg hash/maphash, method (*Hash) Sum([]uint8) []uint8

pkg archive/zip, type FileHeader struct, UncompressedSize //deprecated
pkg compress/flate, type ReadError //deprecated
pkg compress/flate, type WriteError //deprecated
pkg crypto/rc4, method (*Cipher) Reset //deprecated
pkg crypto/tls, const VersionSSL30 //deprecated
pkg crypto/tls, method (*Config) BuildNameToCertificate //deprecated
pkg crypto/tls, type Config struct, NameToCertificate //deprecated

pkg time, const Tuesday = 2
pkg time, const UnixDate = "Mon Jan _2 15:04:05 MST 2006"
pkg time, const Wednesday = 3
pkg time, func ParseInLocation(string, string, *Location) (Time, error)
pkg time, method (*Timer) Reset(Duration) bool
pkg time, method (Time) Round(Duration) Time
pkg time, method (Time) Truncate(Duration) Time
pkg time, method (Time) YearDay() int
pkg unicode, const LowerCase = 1