code: function enter(compiler, node) {
    var encode = compiler.encode
    var escape = compiler.escape
    var exitLink = compiler.enterLink()
  
    if (node.referenceType !== 'shortcut' && node.referenceType !== 'collapsed') {
      return exitLink
    }
  
    compiler.escape = identity
    compiler.encode = identity
  
    return exit
  
    function exit() {
      compiler.encode = encode
      compiler.escape = escape
      exitLink()
    }
  }
docs: Shortcut and collapsed link references need no escaping and encoding during the processing of child nodes (it must be implied from identifier).  This toggler turns encoding and escaping off for shortcut and collapsed references.  Implies `enterLink`.