qualified domain name (FQDN) of a Pod is set as hostname of its containers. 
  In Linux containers, this means setting the FQDN in the hostname field of the 
  kernel (the nodename field of struct utsname).  In Windows containers, this
  means setting the this means setting the registry value of hostname for the registry key HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters to FQDN. 

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

A930..A953    ; valid                                  # 5.1  REJANG LETTER KA..REJANG VIRAMA
A954..A95E    ; disallowed                             # NA   <reserved-A954>..<reserved-A95E>
A95F          ; valid                  ;      ; NV8    # 5.1  REJANG SECTION MARK
A960..A97C    ; valid                  ;      ; NV8    # 5.2  HANGUL CHOSEONG TIKEUT-MIEUM..HANGUL CHOSEONG SSANGYEORINHIEUH

AAA,KoBlRJ,YAAA,IACA,YAAA,IACA,MAAA,qBACA,iBAAA,kBACA,iBAAA,4BAAA,CAAA,mCACA,kBAAA,UACA,oBAAA,MAAA,OAAA,OACA,gBAAA,KAAA,KACA,OAAA,uBAAA,MAAA,uBjBFE,cAAA,wBeHE,WAAA,aAAA,KAAA,WAAA,CAAA,WAAA,KAAA,YESJ,mBAAA,KAAA,gBAAA,KAAA,WAAA,KFLI,uCEfN,aFgBQ,WAAA,MEMN,mBACE,aAAA,QACA,QAAA,EAKE,WAAA,EAAA,EAAA,EAAA,OAAA,qBAIJ,uBAAA,mCAEE,cAAA,OACA,iBAAA,KAGF,sBAEE,iBAAA,uBAKF,4BACE,MAAA,YACA,YAAA,EAAA,EAAA,EAAA,qBAIJ,gBACE,YAAA,OACA,eAAA,OACA,aAAA,MpBmOI,UAAA,QG5QF,cAAA,2BiB8CJ,gBACE,YAAA,MACA,eAAA,MACA,aAAA,KpB2...

background-color: $body-bg; // 2\n}\n\n// Future-proof rule: in browsers that support :focus-visible, suppress the focus outline\n// on elements that programmatically receive focus but wouldn't normally show a visible\n// focus outline. In general, this would mean that the outline is only applied if the\n// interaction that led to the element receiving programmatic focus was a keyboard interaction,\n// or the browser has somehow determined that the user is primarily a keyboard user and/or\n// wants focus outlines...