code: def page_strip(page, versioned):
      
      # page strip filtering should be conditional
      page.pop('ResponseMetadata', None)
      contents_key = versioned and 'Versions' or 'Contents'
      contents = page.get(contents_key, ())
  
      # aggressive size
      if versioned:
          keys = []
          for k in contents:
              if k['IsLatest']:
                  keys.append((k['Key'], k['VersionId'], True))
              else:
                  keys.append((k['Key'], k['VersionId']))
          return keys
      else:
          return [k['Key'] for k in contents]
  
      if not contents:
          return page
  
      # Depending on use case we may want these
      for k in contents:
          k.pop('Owner', None)
          k.pop('LastModified', None)
          k.pop('ETag', None)
          k.pop('StorageClass', None)
          k.pop('Size', None)
  
      return page
docs: Remove bits in content results to minimize memory utilization.
  
      TODO: evolve this to a key filter on metadata, like date