code: def yaml_tag_constructor(loader, tag, node):
      
      def _f(loader, tag, node):
          if tag == '!GetAtt':
              return node.value.split('.')
          elif type(node) == yaml.SequenceNode:
              return loader.construct_sequence(node)
          else:
              return node.value
  
      if tag == '!Ref':
          key = 'Ref'
      else:
          key = 'Fn::{}'.format(tag[1:])
  
      return {key: _f(loader, tag, node)}
docs: convert shorthand intrinsic function to full name